My iMac is shutting down on my while its asleep

My computer:
- First generation G5 iMac
- 1.8ghz (I think) G5, 512 MB ram
- Latest OS 10.4.X
Hi,
It seems that when my iMac is asleep it randomly powers off. One minute I notice the light happily throbbing and snoozing away and the next minute it is dark.
We generally leave it on 24/7 and let it put itself to sleep after 30 minutes or so.
It started doing this about 2 days ago.
The first time I noticed it something even more strange happened. The power was off. When I hit the button to power it on, it would not start up. Holding the button down I got it to chime, but it shut off after a couple seconds. After a few more pushes, the fans kicked on in HIGH gear and stayed on. After disconnecting all the wires and doing this a few more times, I got it to boot up.
The computer seems to be working fine. Disk first aid found nothing wrong. The only problem is that it shuts off now.
Can any of you help me fix/diagnose this?
I have applecare on it by the way (I'd just like to take care of it myself if its something simple rather than take the computer in).
17" G5 iMac (first gen) Mac OS X (10.4.6)

Hi Mark, welcome to Discussions -
sounds like another classic case of Power Supply Unit failure. Check and see if your serial number is found here, Apple is aware of the problem and has a program to deal with it. I also suggest you make a backup of your data ( I use SuperDuper!).
Good luck,
Miriam

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Message was edited by: OregonMac7

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1. This is a comment on what you should and should not do to protect yourself from malicious software ("malware") that circulates on the Internet. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the victim's computer. That threat is in a different category, and there's no easy way to defend against it. If you have reason to suspect that you're the target of such an attack, you need expert help.
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