The Cube
has some very well known power issues with several possible causes
and fairly simple fixes in some cases. A large number of people who experience random sleep/shut downs/startups
and restarts have found that simply placing a thick piece of paper
(like resume bond), some scotch tape or a piece cut from an anti-static
bag
under the power gasket (directly over the power "switch" on
the core) resolved their problem. Ken B wrote in that he even used
a few of those
loose-leaf paper
reinforcements, the round stickers you place over the holes on 3-ring
paper to prevent them from ripping out of binders. However, this fix
won't solve
all problems for everyone. It's free and worth a shot though. Any problem
you are having relating to power (random startups, shutdowns, sleep
activation, wake-ups) is worthy of trying any of the above-mentioned
tricks to fix
it.
Other well-known
causes of intermittent power problems include: a loose DC/DC card (remove
your Cube from it's core and reseat the DC/DC
board to solve); a rogue USB device (yes, even the keyboard and/or
the mouse can be the culprit, not just hubs, printers and the like);
a PRAM battery in need of replacement; a short in your Power Supply
Unit (PSU); and the problem could also be related to your Monitor or
Display. Take a few days to test all the above theories before giving
up hope.
The following
articles in the Apple KnowledgeBase should help you if you
are experiencing
power problems:
Power:Power
Button Lights Up, But Computer Does Not Turn On [#88037]
Power: Random Activation of the Power Button [#88044]
iMac,
Cube, G4: Restarts Instead of Shutting Down [#58171]
Power
Mac G4 Cube: Replacing the Power Button Gasket
