G4 Shut Down

geordie · #1 July 25th, 2005, 10:30 AM

I am unable to shut down my G4 laptop. I select shut down from the menu bar or by pressing the power button and the G4 turns off , then it immediately restarts. What can I do to resolve this problem?

**Cheryl** · #2 July 25th, 2005, 07:20 PM

Try reseting the PRAM.

Restart the computer and then immediately hold down the Apple Key + Option + P + R. You should hold down those keys until you hear the start up chime three times. Then release the keys.

You will need to reset Date & Time and a few other options, but this should correct the problem.

Tempharry · #3 February 21st, 2007, 08:41 AM

I have the same problem on a gigabit ethernet sawtooth g4.
I shut it down, it shuts down, then restarts. Every time.

I have:
- run apple hardware test (all fine)
- booted from four different systems (OS 9.something, OS X 10.3.9, 10.4.3, 10.4.9)
- off two seperate HDs (disk one had: 9, 10.3.9, 10.4.3 disk two had: 10.4.9)
- set all energy saver prefs to never/not selected (in all systems)
- set energy saver scheduled shutdowns (10.3.9 only... didn't help)
- disconnected ALL peripherals (even the 3rd party VGA monitor) except the original Apple keyboard (working blind: hit ctrl-eject, wait, hit return)
- tried two different Apple keyboards
- reset PRAM (five chimes)
- reset SMU/PMU (button above the battery, unplugged, one press only)
- flogged a dead horse

and the problem persits. Every time. Driving me mental!
What can I do???
(only metaphorical animals were injured in the making of this post)

dixonbm · #4 February 23rd, 2007, 09:41 PM

Unplug the power cable

Tempharry · #5 February 23rd, 2007, 11:19 PM

Hilarious!

That's what I'm doing actually, and it's a real pain in the @ss.

Proceedure:
- shut down geefah by fave standard method
- hover at wall switch until the little white light turns off
- flick switch off FAST

So the beast is always at least 1/4 second in to starting up again when the juice is cut. I hope this isn't going to fry something in my [early startup stuff] over time.

bobw · #6 February 24th, 2007, 09:13 AM

Sounds like the power button could be bad.

Tempharry · #7 February 24th, 2007, 08:33 PM

Yeah, it could be. I took it out last week, and blew it clean, but there doesn't seem to be much else I can do in there. The external "power button" is really just the equivalent of a plastic broomstick which pokes into the case and presses a micro switch soldered onto a little circuit board.

I'm sorely tempted to break off the micro switch, and solder in a dirty-great-big (preferably red) momentary switch, and drill that into the casing in some deliberately asymmetric and inappropriate spot.

...but then, what if it isn't the switch? What if (as my reading of every remotely related Google hit seems to hint at) it's a problem with the (out of spec, thanks Apple) USB power-on-by-keyboard system?

Kees Buijs · #8 March 6th, 2007, 11:40 AM

Quote:

Originally Posted by geordie

I am unable to shut down my G4 laptop. I select shut down from the menu bar or by pressing the power button and the G4 turns off , then it immediately restarts. What can I do to resolve this problem?

It is possible to configure the system so, that is turns ON again on a power down. Maybe this settings is turned ON (in power management) and that cause the system to turn ON after a power down (HIGHLY required for e.g. SERVERS, which should be online 24/7). After a power loose, the SERVER restarts automaticly and will be online without user interaction.

For normal systems, this can be a pian in the ...

Good luck, Kees