My Mac repeatedly beeps three times on startup. What does this mean?

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up vote
29
down vote

favorite
1












When I try to boot my Mac I get nothing but strange beeps. They beep as follows:



BEEP BEEP BEEP [3 second pause] BEEP BEEP BEEP [3 second pause] and it continues until I power off.



So far, I have:



  • checked with Apple KB - About Mac startup tones and this pattern is not listed as an official form of communication.

  • rebooted a number of times and the same exact pattern occurs.

  • used a timer to verify it is definitely 3 seconds in between the 3 beeps.

  • booted into Apple Hardware Test and no problems found after running extended tests

Is my Mac possessed? Assuming not, what is it trying to tell me?



Background



For various reasons I want to re-install the original Mac OS X. To do this I am trying to boot from an original Snow Leopard disc in the SuperDrive. I have no reason to suspect a problem with either the disc (no scratches or other signs of damage and it boots a Mid 2009 MacBook Pro just fine) or the optical drive (it loads other discs fine).



The Mac boots fine otherwise (both normally and in Safe Mode), but just doesn’t want to boot from this disc and I have no idea why, but I’m pretty sure the beeps are the key! :)



Specifications:



  • iMac, 27", Mid 2011

  • 16GB RAM

  • 2 GB GDDR5 (Radeon HD 6970M)

  • 3.4GHz Intel Core i7

  • Mac OS X El Capitan 10.11.6 installed on the internal drive

Update



Upon checking after Monomeeth's answer I can add that the original Snow Leopard disc I am trying to boot from is indeed a retail version containing 10.6.3.
enter image description here










share|improve this question



















  • 1




    "I will follow Monomeeth's advice and updated my question with the results." - Note that in general, you shouldn't edit the outcome of following an answer's advice into the question itself; instead, accept that answer (if it works) and leave your description of the outcome as a comment on that answer.
    – V2Blast
    Sep 6 at 7:51







  • 2




    @V2Blast Thank you for the explanation. :)
    – user301113
    Sep 6 at 12:46














up vote
29
down vote

favorite
1












When I try to boot my Mac I get nothing but strange beeps. They beep as follows:



BEEP BEEP BEEP [3 second pause] BEEP BEEP BEEP [3 second pause] and it continues until I power off.



So far, I have:



  • checked with Apple KB - About Mac startup tones and this pattern is not listed as an official form of communication.

  • rebooted a number of times and the same exact pattern occurs.

  • used a timer to verify it is definitely 3 seconds in between the 3 beeps.

  • booted into Apple Hardware Test and no problems found after running extended tests

Is my Mac possessed? Assuming not, what is it trying to tell me?



Background



For various reasons I want to re-install the original Mac OS X. To do this I am trying to boot from an original Snow Leopard disc in the SuperDrive. I have no reason to suspect a problem with either the disc (no scratches or other signs of damage and it boots a Mid 2009 MacBook Pro just fine) or the optical drive (it loads other discs fine).



The Mac boots fine otherwise (both normally and in Safe Mode), but just doesn’t want to boot from this disc and I have no idea why, but I’m pretty sure the beeps are the key! :)



Specifications:



  • iMac, 27", Mid 2011

  • 16GB RAM

  • 2 GB GDDR5 (Radeon HD 6970M)

  • 3.4GHz Intel Core i7

  • Mac OS X El Capitan 10.11.6 installed on the internal drive

Update



Upon checking after Monomeeth's answer I can add that the original Snow Leopard disc I am trying to boot from is indeed a retail version containing 10.6.3.
enter image description here










share|improve this question



















  • 1




    "I will follow Monomeeth's advice and updated my question with the results." - Note that in general, you shouldn't edit the outcome of following an answer's advice into the question itself; instead, accept that answer (if it works) and leave your description of the outcome as a comment on that answer.
    – V2Blast
    Sep 6 at 7:51







  • 2




    @V2Blast Thank you for the explanation. :)
    – user301113
    Sep 6 at 12:46












up vote
29
down vote

favorite
1









up vote
29
down vote

favorite
1






1





When I try to boot my Mac I get nothing but strange beeps. They beep as follows:



BEEP BEEP BEEP [3 second pause] BEEP BEEP BEEP [3 second pause] and it continues until I power off.



So far, I have:



  • checked with Apple KB - About Mac startup tones and this pattern is not listed as an official form of communication.

  • rebooted a number of times and the same exact pattern occurs.

  • used a timer to verify it is definitely 3 seconds in between the 3 beeps.

  • booted into Apple Hardware Test and no problems found after running extended tests

Is my Mac possessed? Assuming not, what is it trying to tell me?



Background



For various reasons I want to re-install the original Mac OS X. To do this I am trying to boot from an original Snow Leopard disc in the SuperDrive. I have no reason to suspect a problem with either the disc (no scratches or other signs of damage and it boots a Mid 2009 MacBook Pro just fine) or the optical drive (it loads other discs fine).



The Mac boots fine otherwise (both normally and in Safe Mode), but just doesn’t want to boot from this disc and I have no idea why, but I’m pretty sure the beeps are the key! :)



Specifications:



  • iMac, 27", Mid 2011

  • 16GB RAM

  • 2 GB GDDR5 (Radeon HD 6970M)

  • 3.4GHz Intel Core i7

  • Mac OS X El Capitan 10.11.6 installed on the internal drive

Update



Upon checking after Monomeeth's answer I can add that the original Snow Leopard disc I am trying to boot from is indeed a retail version containing 10.6.3.
enter image description here










share|improve this question















When I try to boot my Mac I get nothing but strange beeps. They beep as follows:



BEEP BEEP BEEP [3 second pause] BEEP BEEP BEEP [3 second pause] and it continues until I power off.



So far, I have:



  • checked with Apple KB - About Mac startup tones and this pattern is not listed as an official form of communication.

  • rebooted a number of times and the same exact pattern occurs.

  • used a timer to verify it is definitely 3 seconds in between the 3 beeps.

  • booted into Apple Hardware Test and no problems found after running extended tests

Is my Mac possessed? Assuming not, what is it trying to tell me?



Background



For various reasons I want to re-install the original Mac OS X. To do this I am trying to boot from an original Snow Leopard disc in the SuperDrive. I have no reason to suspect a problem with either the disc (no scratches or other signs of damage and it boots a Mid 2009 MacBook Pro just fine) or the optical drive (it loads other discs fine).



The Mac boots fine otherwise (both normally and in Safe Mode), but just doesn’t want to boot from this disc and I have no idea why, but I’m pretty sure the beeps are the key! :)



Specifications:



  • iMac, 27", Mid 2011

  • 16GB RAM

  • 2 GB GDDR5 (Radeon HD 6970M)

  • 3.4GHz Intel Core i7

  • Mac OS X El Capitan 10.11.6 installed on the internal drive

Update



Upon checking after Monomeeth's answer I can add that the original Snow Leopard disc I am trying to boot from is indeed a retail version containing 10.6.3.
enter image description here







imac boot snow-leopard startup






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Sep 6 at 19:47









V2Blast

1135




1135










asked Sep 5 at 9:50









user301113

14827




14827







  • 1




    "I will follow Monomeeth's advice and updated my question with the results." - Note that in general, you shouldn't edit the outcome of following an answer's advice into the question itself; instead, accept that answer (if it works) and leave your description of the outcome as a comment on that answer.
    – V2Blast
    Sep 6 at 7:51







  • 2




    @V2Blast Thank you for the explanation. :)
    – user301113
    Sep 6 at 12:46












  • 1




    "I will follow Monomeeth's advice and updated my question with the results." - Note that in general, you shouldn't edit the outcome of following an answer's advice into the question itself; instead, accept that answer (if it works) and leave your description of the outcome as a comment on that answer.
    – V2Blast
    Sep 6 at 7:51







  • 2




    @V2Blast Thank you for the explanation. :)
    – user301113
    Sep 6 at 12:46







1




1




"I will follow Monomeeth's advice and updated my question with the results." - Note that in general, you shouldn't edit the outcome of following an answer's advice into the question itself; instead, accept that answer (if it works) and leave your description of the outcome as a comment on that answer.
– V2Blast
Sep 6 at 7:51





"I will follow Monomeeth's advice and updated my question with the results." - Note that in general, you shouldn't edit the outcome of following an answer's advice into the question itself; instead, accept that answer (if it works) and leave your description of the outcome as a comment on that answer.
– V2Blast
Sep 6 at 7:51





2




2




@V2Blast Thank you for the explanation. :)
– user301113
Sep 6 at 12:46




@V2Blast Thank you for the explanation. :)
– user301113
Sep 6 at 12:46










1 Answer
1






active

oldest

votes

















up vote
45
down vote



accepted










No, your Mac is not possessed. And Yes, it’s trying to tell you something!



A looping three beeps in between three seconds during startup is your iMac’s way of telling you that the operating system you’re trying to boot into is incompatible with your Mac hardware.



In other words, the Snow Leopard disc you’re trying to boot from contains a version of Snow Leopard that is earlier than version 10.6.6 (the earliest your iMac can support).



My guess is that you’re not using the grey disc that shipped with your iMac. It’s either one that belongs to another Mac or it’s a retail version that’s earlier than 10.6.6.



The only ways to get around this is to use another disc or do the following:



  1. Boot your iMac into Target Disk Mode by pressing and holding the T key as you startup

  2. Connect it to your Mid 2009 MBP with a FireWire cable (once connected it’ll be seen by the MBP as an external hard drive)

  3. Boot the MBP from the Snow Leopard disc

  4. Now install Snow Leopard onto the external drive (i.e. the iMac’s drive)

  5. Reboot the MBP from the iMac drive and then upgrade Snow Leopard to the latest version (i.e. 10.6.8) so that you know for sure it’ll boot the iMac fine

  6. Shutdown both the MBP and iMac and then try rebooting the iMac as normal from its internal drive that now has Snow Leopard installed.

WARNING: You should always ensure you have a backup of your data, especially when performing operations such as this!






share|improve this answer
















  • 2




    I'd be hesitant to recommend this—if it doesn't boot from the CD, is it really likely to boot from the disk?
    – Kevin
    Sep 5 at 16:18






  • 2




    @Kevin: A similar process for installing Windows 10 on older iMacs works just fine (where Bootcamp is limited to Windows 8), so it might work okay.
    – user128216
    Sep 5 at 17:52







  • 2




    @Kevin Thanks for the comment. The beeping pattern described by the OP definitely means the OS isn’t compatible. Since they’re trying to install Snow Leopard, we know it must be version 10.6.0 to 10.6.5 they’re trying to boot from as their iMac does support 10.6.6 to 10.6.8. So, assuming there’s no other unknown issues, then following my steps will work as long as they remember to do Step 5 (as that’s what will update the installed version to a compatible one). Hopefully the OP will report back either way. If you have any other questions please feel free to ask. :)
    – Monomeeth♦
    Sep 5 at 22:30






  • 3




    @user301113 Yep, it certainly fits! And thank you for coming back to share your results, it's sure to help others down the track! :)
    – Monomeeth♦
    Sep 6 at 4:46






  • 4




    @Monomeeth You're a legend! I followed your steps and my Mac is now purring nicely on Snow Leopard. It was actually very easy to do. :)
    – user301113
    Sep 6 at 12:45










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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
45
down vote



accepted










No, your Mac is not possessed. And Yes, it’s trying to tell you something!



A looping three beeps in between three seconds during startup is your iMac’s way of telling you that the operating system you’re trying to boot into is incompatible with your Mac hardware.



In other words, the Snow Leopard disc you’re trying to boot from contains a version of Snow Leopard that is earlier than version 10.6.6 (the earliest your iMac can support).



My guess is that you’re not using the grey disc that shipped with your iMac. It’s either one that belongs to another Mac or it’s a retail version that’s earlier than 10.6.6.



The only ways to get around this is to use another disc or do the following:



  1. Boot your iMac into Target Disk Mode by pressing and holding the T key as you startup

  2. Connect it to your Mid 2009 MBP with a FireWire cable (once connected it’ll be seen by the MBP as an external hard drive)

  3. Boot the MBP from the Snow Leopard disc

  4. Now install Snow Leopard onto the external drive (i.e. the iMac’s drive)

  5. Reboot the MBP from the iMac drive and then upgrade Snow Leopard to the latest version (i.e. 10.6.8) so that you know for sure it’ll boot the iMac fine

  6. Shutdown both the MBP and iMac and then try rebooting the iMac as normal from its internal drive that now has Snow Leopard installed.

WARNING: You should always ensure you have a backup of your data, especially when performing operations such as this!






share|improve this answer
















  • 2




    I'd be hesitant to recommend this—if it doesn't boot from the CD, is it really likely to boot from the disk?
    – Kevin
    Sep 5 at 16:18






  • 2




    @Kevin: A similar process for installing Windows 10 on older iMacs works just fine (where Bootcamp is limited to Windows 8), so it might work okay.
    – user128216
    Sep 5 at 17:52







  • 2




    @Kevin Thanks for the comment. The beeping pattern described by the OP definitely means the OS isn’t compatible. Since they’re trying to install Snow Leopard, we know it must be version 10.6.0 to 10.6.5 they’re trying to boot from as their iMac does support 10.6.6 to 10.6.8. So, assuming there’s no other unknown issues, then following my steps will work as long as they remember to do Step 5 (as that’s what will update the installed version to a compatible one). Hopefully the OP will report back either way. If you have any other questions please feel free to ask. :)
    – Monomeeth♦
    Sep 5 at 22:30






  • 3




    @user301113 Yep, it certainly fits! And thank you for coming back to share your results, it's sure to help others down the track! :)
    – Monomeeth♦
    Sep 6 at 4:46






  • 4




    @Monomeeth You're a legend! I followed your steps and my Mac is now purring nicely on Snow Leopard. It was actually very easy to do. :)
    – user301113
    Sep 6 at 12:45














up vote
45
down vote



accepted










No, your Mac is not possessed. And Yes, it’s trying to tell you something!



A looping three beeps in between three seconds during startup is your iMac’s way of telling you that the operating system you’re trying to boot into is incompatible with your Mac hardware.



In other words, the Snow Leopard disc you’re trying to boot from contains a version of Snow Leopard that is earlier than version 10.6.6 (the earliest your iMac can support).



My guess is that you’re not using the grey disc that shipped with your iMac. It’s either one that belongs to another Mac or it’s a retail version that’s earlier than 10.6.6.



The only ways to get around this is to use another disc or do the following:



  1. Boot your iMac into Target Disk Mode by pressing and holding the T key as you startup

  2. Connect it to your Mid 2009 MBP with a FireWire cable (once connected it’ll be seen by the MBP as an external hard drive)

  3. Boot the MBP from the Snow Leopard disc

  4. Now install Snow Leopard onto the external drive (i.e. the iMac’s drive)

  5. Reboot the MBP from the iMac drive and then upgrade Snow Leopard to the latest version (i.e. 10.6.8) so that you know for sure it’ll boot the iMac fine

  6. Shutdown both the MBP and iMac and then try rebooting the iMac as normal from its internal drive that now has Snow Leopard installed.

WARNING: You should always ensure you have a backup of your data, especially when performing operations such as this!






share|improve this answer
















  • 2




    I'd be hesitant to recommend this—if it doesn't boot from the CD, is it really likely to boot from the disk?
    – Kevin
    Sep 5 at 16:18






  • 2




    @Kevin: A similar process for installing Windows 10 on older iMacs works just fine (where Bootcamp is limited to Windows 8), so it might work okay.
    – user128216
    Sep 5 at 17:52







  • 2




    @Kevin Thanks for the comment. The beeping pattern described by the OP definitely means the OS isn’t compatible. Since they’re trying to install Snow Leopard, we know it must be version 10.6.0 to 10.6.5 they’re trying to boot from as their iMac does support 10.6.6 to 10.6.8. So, assuming there’s no other unknown issues, then following my steps will work as long as they remember to do Step 5 (as that’s what will update the installed version to a compatible one). Hopefully the OP will report back either way. If you have any other questions please feel free to ask. :)
    – Monomeeth♦
    Sep 5 at 22:30






  • 3




    @user301113 Yep, it certainly fits! And thank you for coming back to share your results, it's sure to help others down the track! :)
    – Monomeeth♦
    Sep 6 at 4:46






  • 4




    @Monomeeth You're a legend! I followed your steps and my Mac is now purring nicely on Snow Leopard. It was actually very easy to do. :)
    – user301113
    Sep 6 at 12:45












up vote
45
down vote



accepted







up vote
45
down vote



accepted






No, your Mac is not possessed. And Yes, it’s trying to tell you something!



A looping three beeps in between three seconds during startup is your iMac’s way of telling you that the operating system you’re trying to boot into is incompatible with your Mac hardware.



In other words, the Snow Leopard disc you’re trying to boot from contains a version of Snow Leopard that is earlier than version 10.6.6 (the earliest your iMac can support).



My guess is that you’re not using the grey disc that shipped with your iMac. It’s either one that belongs to another Mac or it’s a retail version that’s earlier than 10.6.6.



The only ways to get around this is to use another disc or do the following:



  1. Boot your iMac into Target Disk Mode by pressing and holding the T key as you startup

  2. Connect it to your Mid 2009 MBP with a FireWire cable (once connected it’ll be seen by the MBP as an external hard drive)

  3. Boot the MBP from the Snow Leopard disc

  4. Now install Snow Leopard onto the external drive (i.e. the iMac’s drive)

  5. Reboot the MBP from the iMac drive and then upgrade Snow Leopard to the latest version (i.e. 10.6.8) so that you know for sure it’ll boot the iMac fine

  6. Shutdown both the MBP and iMac and then try rebooting the iMac as normal from its internal drive that now has Snow Leopard installed.

WARNING: You should always ensure you have a backup of your data, especially when performing operations such as this!






share|improve this answer












No, your Mac is not possessed. And Yes, it’s trying to tell you something!



A looping three beeps in between three seconds during startup is your iMac’s way of telling you that the operating system you’re trying to boot into is incompatible with your Mac hardware.



In other words, the Snow Leopard disc you’re trying to boot from contains a version of Snow Leopard that is earlier than version 10.6.6 (the earliest your iMac can support).



My guess is that you’re not using the grey disc that shipped with your iMac. It’s either one that belongs to another Mac or it’s a retail version that’s earlier than 10.6.6.



The only ways to get around this is to use another disc or do the following:



  1. Boot your iMac into Target Disk Mode by pressing and holding the T key as you startup

  2. Connect it to your Mid 2009 MBP with a FireWire cable (once connected it’ll be seen by the MBP as an external hard drive)

  3. Boot the MBP from the Snow Leopard disc

  4. Now install Snow Leopard onto the external drive (i.e. the iMac’s drive)

  5. Reboot the MBP from the iMac drive and then upgrade Snow Leopard to the latest version (i.e. 10.6.8) so that you know for sure it’ll boot the iMac fine

  6. Shutdown both the MBP and iMac and then try rebooting the iMac as normal from its internal drive that now has Snow Leopard installed.

WARNING: You should always ensure you have a backup of your data, especially when performing operations such as this!







share|improve this answer












share|improve this answer



share|improve this answer










answered Sep 5 at 10:03









Monomeeth♦

42.4k690131




42.4k690131







  • 2




    I'd be hesitant to recommend this—if it doesn't boot from the CD, is it really likely to boot from the disk?
    – Kevin
    Sep 5 at 16:18






  • 2




    @Kevin: A similar process for installing Windows 10 on older iMacs works just fine (where Bootcamp is limited to Windows 8), so it might work okay.
    – user128216
    Sep 5 at 17:52







  • 2




    @Kevin Thanks for the comment. The beeping pattern described by the OP definitely means the OS isn’t compatible. Since they’re trying to install Snow Leopard, we know it must be version 10.6.0 to 10.6.5 they’re trying to boot from as their iMac does support 10.6.6 to 10.6.8. So, assuming there’s no other unknown issues, then following my steps will work as long as they remember to do Step 5 (as that’s what will update the installed version to a compatible one). Hopefully the OP will report back either way. If you have any other questions please feel free to ask. :)
    – Monomeeth♦
    Sep 5 at 22:30






  • 3




    @user301113 Yep, it certainly fits! And thank you for coming back to share your results, it's sure to help others down the track! :)
    – Monomeeth♦
    Sep 6 at 4:46






  • 4




    @Monomeeth You're a legend! I followed your steps and my Mac is now purring nicely on Snow Leopard. It was actually very easy to do. :)
    – user301113
    Sep 6 at 12:45












  • 2




    I'd be hesitant to recommend this—if it doesn't boot from the CD, is it really likely to boot from the disk?
    – Kevin
    Sep 5 at 16:18






  • 2




    @Kevin: A similar process for installing Windows 10 on older iMacs works just fine (where Bootcamp is limited to Windows 8), so it might work okay.
    – user128216
    Sep 5 at 17:52







  • 2




    @Kevin Thanks for the comment. The beeping pattern described by the OP definitely means the OS isn’t compatible. Since they’re trying to install Snow Leopard, we know it must be version 10.6.0 to 10.6.5 they’re trying to boot from as their iMac does support 10.6.6 to 10.6.8. So, assuming there’s no other unknown issues, then following my steps will work as long as they remember to do Step 5 (as that’s what will update the installed version to a compatible one). Hopefully the OP will report back either way. If you have any other questions please feel free to ask. :)
    – Monomeeth♦
    Sep 5 at 22:30






  • 3




    @user301113 Yep, it certainly fits! And thank you for coming back to share your results, it's sure to help others down the track! :)
    – Monomeeth♦
    Sep 6 at 4:46






  • 4




    @Monomeeth You're a legend! I followed your steps and my Mac is now purring nicely on Snow Leopard. It was actually very easy to do. :)
    – user301113
    Sep 6 at 12:45







2




2




I'd be hesitant to recommend this—if it doesn't boot from the CD, is it really likely to boot from the disk?
– Kevin
Sep 5 at 16:18




I'd be hesitant to recommend this—if it doesn't boot from the CD, is it really likely to boot from the disk?
– Kevin
Sep 5 at 16:18




2




2




@Kevin: A similar process for installing Windows 10 on older iMacs works just fine (where Bootcamp is limited to Windows 8), so it might work okay.
– user128216
Sep 5 at 17:52





@Kevin: A similar process for installing Windows 10 on older iMacs works just fine (where Bootcamp is limited to Windows 8), so it might work okay.
– user128216
Sep 5 at 17:52





2




2




@Kevin Thanks for the comment. The beeping pattern described by the OP definitely means the OS isn’t compatible. Since they’re trying to install Snow Leopard, we know it must be version 10.6.0 to 10.6.5 they’re trying to boot from as their iMac does support 10.6.6 to 10.6.8. So, assuming there’s no other unknown issues, then following my steps will work as long as they remember to do Step 5 (as that’s what will update the installed version to a compatible one). Hopefully the OP will report back either way. If you have any other questions please feel free to ask. :)
– Monomeeth♦
Sep 5 at 22:30




@Kevin Thanks for the comment. The beeping pattern described by the OP definitely means the OS isn’t compatible. Since they’re trying to install Snow Leopard, we know it must be version 10.6.0 to 10.6.5 they’re trying to boot from as their iMac does support 10.6.6 to 10.6.8. So, assuming there’s no other unknown issues, then following my steps will work as long as they remember to do Step 5 (as that’s what will update the installed version to a compatible one). Hopefully the OP will report back either way. If you have any other questions please feel free to ask. :)
– Monomeeth♦
Sep 5 at 22:30




3




3




@user301113 Yep, it certainly fits! And thank you for coming back to share your results, it's sure to help others down the track! :)
– Monomeeth♦
Sep 6 at 4:46




@user301113 Yep, it certainly fits! And thank you for coming back to share your results, it's sure to help others down the track! :)
– Monomeeth♦
Sep 6 at 4:46




4




4




@Monomeeth You're a legend! I followed your steps and my Mac is now purring nicely on Snow Leopard. It was actually very easy to do. :)
– user301113
Sep 6 at 12:45




@Monomeeth You're a legend! I followed your steps and my Mac is now purring nicely on Snow Leopard. It was actually very easy to do. :)
– user301113
Sep 6 at 12:45

















 

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