What happens when I pull the plug?

I've been having this problem that nobody seems to know the answer. Occasionally when the Mac sleeps for a long time (i.e. over 30 minutes) it goes into a coma and won't wake up. When I press a key to wake it up it makes an attempt, then poops out after about a half second. If I push the power button at this point the light lights up (while I'm pressing down) but no fan spinup. I have to unplug the computer just to get it to start up again.

My question is actually this: it seems, and maybe I'm imagining it, but it seems like when I leave the plug out for, say, overnight the problem does not reoccur for some time (like a week or so). But if I just unplug the thing for 15 seconds, it could occur the very next day. So what difference is there between unplugging for hours versus seconds? And does info lead anyone to suggest an answer to fixing this problem?

Dual 867 G4, Mac OS X (10.3.9), 1.75 GB RAM

Posted on Jan 29, 2006 7:13 AM

Reply
2 replies

Jan 29, 2006 1:48 PM in response to David Reynolds2

If your Mac happily goes to sleep but won't wake up--Hold down the power switch to force-reboot your machine and get it running again.
Don't worry-your Mac isn't narcoleptic. Its Open Firmware system or NVRAM (nonvolatile RAM) is likely corrupt, and your Mac can't remember how to wake up.
Restart your Mac and immediately hold down the Command-Option-O-F key combo until you see a somewhat intimidating command-line display that ends with the Open Fimware prompt. Type the following lines:
reset-nvram
press Return on keyboard
set-defaults
press Return
reset-all
press Return
Your Mac will reboot. Once it's running, put it back to sleep to test. If the problem recurs your Energy Saver preferences may be the culprit. Delete the com.apple.PowerManagement.plist file (go to Finder/Hard drive/Library/Preferences/SystemConfiguration)--don't worry, your Mac will regenerate a new one--and then restart to see if that rights the wrong.
Still did'nt work? Might be time to call AppleCare or see an Apple Genius or a technician.

Cheers!
DALE

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

What happens when I pull the plug?

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.