When does a mac laptop startup automatically after a power failure?
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I'm trying to get the hang of this. I notice that sometimes when I plug the charger the macbook boots automatically, other times it doesn't. I know in desktop macs this is determined by a setting in Energy preferences, but not sure when this is supposed to happen with macbooks. Does it change with the model? It's good to know this for troubleshooting. Any insights would be much appreciated.
macbook
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up vote
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I'm trying to get the hang of this. I notice that sometimes when I plug the charger the macbook boots automatically, other times it doesn't. I know in desktop macs this is determined by a setting in Energy preferences, but not sure when this is supposed to happen with macbooks. Does it change with the model? It's good to know this for troubleshooting. Any insights would be much appreciated.
macbook
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up vote
1
down vote
favorite
up vote
1
down vote
favorite
I'm trying to get the hang of this. I notice that sometimes when I plug the charger the macbook boots automatically, other times it doesn't. I know in desktop macs this is determined by a setting in Energy preferences, but not sure when this is supposed to happen with macbooks. Does it change with the model? It's good to know this for troubleshooting. Any insights would be much appreciated.
macbook
I'm trying to get the hang of this. I notice that sometimes when I plug the charger the macbook boots automatically, other times it doesn't. I know in desktop macs this is determined by a setting in Energy preferences, but not sure when this is supposed to happen with macbooks. Does it change with the model? It's good to know this for troubleshooting. Any insights would be much appreciated.
macbook
asked Aug 21 at 11:51
Antonio23249
33819
33819
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2 Answers
2
active
oldest
votes
up vote
2
down vote
Regardless of of the Mac model, the power settings determine if it will boot upon power failure. If this option isn't set, it won't boot.
2
but macbooks don't have this setting if I'm right? that's what I'm querying about.
â Antonio23249
Aug 21 at 19:30
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up vote
0
down vote
It appears that this feature is controlled by a parameter in the Mac's NVRAM (non-volatile RAM, which contains various parameters used during the startup process). The parameter in question is AutoBoot
, which controls whether the MacBook will automatically boot when the lid is opened or power is connected (note that there appears to be no way to separate these settingsâÂÂif you disable boot-on-power, you also disable boot-on-lid-open). The %00
value for this parameter disables automatic boot, and %03
re-enables it. These values can be changed using the nvram
command-line tool.
So, to disable automatic booting when power is connected, run the following command in the Terminal application (found in /Applications/Utilities/Terminal.app
) by copy-pasting it into the Terminal, then pressing return. Note that this must be run by an administrator account.
sudo nvram AutoBoot=%00
You'll then see a prompt that looks like this:
Type your password, then press return. Nothing will appear on the screen as you are typing; this is normal.
To revert the changes (i.e., to restore the automatic booting behavior), execute the following command (once again as an administrator):
sudo nvram AutoBoot=%03
After entering your password (if prompted), the setting will be reset to the default.
To view the current values of the data in NVRAM, run the command nvram -p
in Terminal. Look for the key on the right-hand side called AutoBoot
. If this is set to %03
, the laptop will automatically boot after a power failure (i.e., when re-connected to AC power); if AutoBoot
set to %00
, it won't.
Note that NVRAM values change from time to time, so this may not be applicable in the future. Moreover, if modification of these values causes further issues, you can reset your NVRAM to its factory state by following this process.
Here's an article with more information about the NVRAM parameters on the 2016 MacBook Pro.
with you folks out there there's no more need for teachers, Thanks!. Also, I knew more or less of this autoboot in newer macs, I was interested mostly on 2015 and before mac laptops. By what I could test last week, these will always boot if you plug the magsafe after having disconnected magsafe and battery connector, so there's no need to use the power-on pads on the logic board to start the mac.
â Antonio23249
Aug 29 at 6:46
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
Regardless of of the Mac model, the power settings determine if it will boot upon power failure. If this option isn't set, it won't boot.
2
but macbooks don't have this setting if I'm right? that's what I'm querying about.
â Antonio23249
Aug 21 at 19:30
add a comment |Â
up vote
2
down vote
Regardless of of the Mac model, the power settings determine if it will boot upon power failure. If this option isn't set, it won't boot.
2
but macbooks don't have this setting if I'm right? that's what I'm querying about.
â Antonio23249
Aug 21 at 19:30
add a comment |Â
up vote
2
down vote
up vote
2
down vote
Regardless of of the Mac model, the power settings determine if it will boot upon power failure. If this option isn't set, it won't boot.
Regardless of of the Mac model, the power settings determine if it will boot upon power failure. If this option isn't set, it won't boot.
answered Aug 21 at 12:01
Allan
37.9k1256141
37.9k1256141
2
but macbooks don't have this setting if I'm right? that's what I'm querying about.
â Antonio23249
Aug 21 at 19:30
add a comment |Â
2
but macbooks don't have this setting if I'm right? that's what I'm querying about.
â Antonio23249
Aug 21 at 19:30
2
2
but macbooks don't have this setting if I'm right? that's what I'm querying about.
â Antonio23249
Aug 21 at 19:30
but macbooks don't have this setting if I'm right? that's what I'm querying about.
â Antonio23249
Aug 21 at 19:30
add a comment |Â
up vote
0
down vote
It appears that this feature is controlled by a parameter in the Mac's NVRAM (non-volatile RAM, which contains various parameters used during the startup process). The parameter in question is AutoBoot
, which controls whether the MacBook will automatically boot when the lid is opened or power is connected (note that there appears to be no way to separate these settingsâÂÂif you disable boot-on-power, you also disable boot-on-lid-open). The %00
value for this parameter disables automatic boot, and %03
re-enables it. These values can be changed using the nvram
command-line tool.
So, to disable automatic booting when power is connected, run the following command in the Terminal application (found in /Applications/Utilities/Terminal.app
) by copy-pasting it into the Terminal, then pressing return. Note that this must be run by an administrator account.
sudo nvram AutoBoot=%00
You'll then see a prompt that looks like this:
Type your password, then press return. Nothing will appear on the screen as you are typing; this is normal.
To revert the changes (i.e., to restore the automatic booting behavior), execute the following command (once again as an administrator):
sudo nvram AutoBoot=%03
After entering your password (if prompted), the setting will be reset to the default.
To view the current values of the data in NVRAM, run the command nvram -p
in Terminal. Look for the key on the right-hand side called AutoBoot
. If this is set to %03
, the laptop will automatically boot after a power failure (i.e., when re-connected to AC power); if AutoBoot
set to %00
, it won't.
Note that NVRAM values change from time to time, so this may not be applicable in the future. Moreover, if modification of these values causes further issues, you can reset your NVRAM to its factory state by following this process.
Here's an article with more information about the NVRAM parameters on the 2016 MacBook Pro.
with you folks out there there's no more need for teachers, Thanks!. Also, I knew more or less of this autoboot in newer macs, I was interested mostly on 2015 and before mac laptops. By what I could test last week, these will always boot if you plug the magsafe after having disconnected magsafe and battery connector, so there's no need to use the power-on pads on the logic board to start the mac.
â Antonio23249
Aug 29 at 6:46
add a comment |Â
up vote
0
down vote
It appears that this feature is controlled by a parameter in the Mac's NVRAM (non-volatile RAM, which contains various parameters used during the startup process). The parameter in question is AutoBoot
, which controls whether the MacBook will automatically boot when the lid is opened or power is connected (note that there appears to be no way to separate these settingsâÂÂif you disable boot-on-power, you also disable boot-on-lid-open). The %00
value for this parameter disables automatic boot, and %03
re-enables it. These values can be changed using the nvram
command-line tool.
So, to disable automatic booting when power is connected, run the following command in the Terminal application (found in /Applications/Utilities/Terminal.app
) by copy-pasting it into the Terminal, then pressing return. Note that this must be run by an administrator account.
sudo nvram AutoBoot=%00
You'll then see a prompt that looks like this:
Type your password, then press return. Nothing will appear on the screen as you are typing; this is normal.
To revert the changes (i.e., to restore the automatic booting behavior), execute the following command (once again as an administrator):
sudo nvram AutoBoot=%03
After entering your password (if prompted), the setting will be reset to the default.
To view the current values of the data in NVRAM, run the command nvram -p
in Terminal. Look for the key on the right-hand side called AutoBoot
. If this is set to %03
, the laptop will automatically boot after a power failure (i.e., when re-connected to AC power); if AutoBoot
set to %00
, it won't.
Note that NVRAM values change from time to time, so this may not be applicable in the future. Moreover, if modification of these values causes further issues, you can reset your NVRAM to its factory state by following this process.
Here's an article with more information about the NVRAM parameters on the 2016 MacBook Pro.
with you folks out there there's no more need for teachers, Thanks!. Also, I knew more or less of this autoboot in newer macs, I was interested mostly on 2015 and before mac laptops. By what I could test last week, these will always boot if you plug the magsafe after having disconnected magsafe and battery connector, so there's no need to use the power-on pads on the logic board to start the mac.
â Antonio23249
Aug 29 at 6:46
add a comment |Â
up vote
0
down vote
up vote
0
down vote
It appears that this feature is controlled by a parameter in the Mac's NVRAM (non-volatile RAM, which contains various parameters used during the startup process). The parameter in question is AutoBoot
, which controls whether the MacBook will automatically boot when the lid is opened or power is connected (note that there appears to be no way to separate these settingsâÂÂif you disable boot-on-power, you also disable boot-on-lid-open). The %00
value for this parameter disables automatic boot, and %03
re-enables it. These values can be changed using the nvram
command-line tool.
So, to disable automatic booting when power is connected, run the following command in the Terminal application (found in /Applications/Utilities/Terminal.app
) by copy-pasting it into the Terminal, then pressing return. Note that this must be run by an administrator account.
sudo nvram AutoBoot=%00
You'll then see a prompt that looks like this:
Type your password, then press return. Nothing will appear on the screen as you are typing; this is normal.
To revert the changes (i.e., to restore the automatic booting behavior), execute the following command (once again as an administrator):
sudo nvram AutoBoot=%03
After entering your password (if prompted), the setting will be reset to the default.
To view the current values of the data in NVRAM, run the command nvram -p
in Terminal. Look for the key on the right-hand side called AutoBoot
. If this is set to %03
, the laptop will automatically boot after a power failure (i.e., when re-connected to AC power); if AutoBoot
set to %00
, it won't.
Note that NVRAM values change from time to time, so this may not be applicable in the future. Moreover, if modification of these values causes further issues, you can reset your NVRAM to its factory state by following this process.
Here's an article with more information about the NVRAM parameters on the 2016 MacBook Pro.
It appears that this feature is controlled by a parameter in the Mac's NVRAM (non-volatile RAM, which contains various parameters used during the startup process). The parameter in question is AutoBoot
, which controls whether the MacBook will automatically boot when the lid is opened or power is connected (note that there appears to be no way to separate these settingsâÂÂif you disable boot-on-power, you also disable boot-on-lid-open). The %00
value for this parameter disables automatic boot, and %03
re-enables it. These values can be changed using the nvram
command-line tool.
So, to disable automatic booting when power is connected, run the following command in the Terminal application (found in /Applications/Utilities/Terminal.app
) by copy-pasting it into the Terminal, then pressing return. Note that this must be run by an administrator account.
sudo nvram AutoBoot=%00
You'll then see a prompt that looks like this:
Type your password, then press return. Nothing will appear on the screen as you are typing; this is normal.
To revert the changes (i.e., to restore the automatic booting behavior), execute the following command (once again as an administrator):
sudo nvram AutoBoot=%03
After entering your password (if prompted), the setting will be reset to the default.
To view the current values of the data in NVRAM, run the command nvram -p
in Terminal. Look for the key on the right-hand side called AutoBoot
. If this is set to %03
, the laptop will automatically boot after a power failure (i.e., when re-connected to AC power); if AutoBoot
set to %00
, it won't.
Note that NVRAM values change from time to time, so this may not be applicable in the future. Moreover, if modification of these values causes further issues, you can reset your NVRAM to its factory state by following this process.
Here's an article with more information about the NVRAM parameters on the 2016 MacBook Pro.
answered Aug 25 at 18:28
aaplmath
1,5201028
1,5201028
with you folks out there there's no more need for teachers, Thanks!. Also, I knew more or less of this autoboot in newer macs, I was interested mostly on 2015 and before mac laptops. By what I could test last week, these will always boot if you plug the magsafe after having disconnected magsafe and battery connector, so there's no need to use the power-on pads on the logic board to start the mac.
â Antonio23249
Aug 29 at 6:46
add a comment |Â
with you folks out there there's no more need for teachers, Thanks!. Also, I knew more or less of this autoboot in newer macs, I was interested mostly on 2015 and before mac laptops. By what I could test last week, these will always boot if you plug the magsafe after having disconnected magsafe and battery connector, so there's no need to use the power-on pads on the logic board to start the mac.
â Antonio23249
Aug 29 at 6:46
with you folks out there there's no more need for teachers, Thanks!. Also, I knew more or less of this autoboot in newer macs, I was interested mostly on 2015 and before mac laptops. By what I could test last week, these will always boot if you plug the magsafe after having disconnected magsafe and battery connector, so there's no need to use the power-on pads on the logic board to start the mac.
â Antonio23249
Aug 29 at 6:46
with you folks out there there's no more need for teachers, Thanks!. Also, I knew more or less of this autoboot in newer macs, I was interested mostly on 2015 and before mac laptops. By what I could test last week, these will always boot if you plug the magsafe after having disconnected magsafe and battery connector, so there's no need to use the power-on pads on the logic board to start the mac.
â Antonio23249
Aug 29 at 6:46
add a comment |Â
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