system reboots after going to sleep

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bcubed

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Hi,

I have a Powerbook G4 with Mac OS X 10.4.5. Instead of going to sleep the machine is rebooting. Even though I've changed all of the power settings to keep the machine active this still happens.

Do you have any suggestions what may be going on?

Thanks in advance, Barry
 

sourcehound

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bcubed said:
Hi,

I have a Powerbook G4 with Mac OS X 10.4.5. Instead of going to sleep the machine is rebooting. Even though I've changed all of the power settings to keep the machine active this still happens.

Do you have any suggestions what may be going on?

Thanks in advance, Barry

Did you install any utiltiies that manage power or sleep states? If not there's a couple of things you can try:

1. zap your PRAM (hold down command+option+P+R) and let the Mac chime 3x
2. reset your OF (Open Firmware) hold down command+option+O+F and at the text prompt type (no leading slashes):
-reset-nvram
-reset-defaults
-reset-all
3. Last, you can reset the Power Manager by unplugging the Powerbook and removing the battery and letting it sit for a few hours
 

bcubed

Registered
Thanks Sourcehound for the suggestions. Zapping the PRAM seems to have fixed the problem.

Cheers,
Barry
 
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