IMac G5 turns off by itself, hard to turn back on...

I purchased my iMac in 2004 - so it looks like I'm past Apples extended "problem parts" warranty. At one point, I had to replace the midplane board, which Apple sent me and I did myself. No biggie - I've built a number of PCs myself.
OK, so if I walk away from the iMac while it's running, it will shut off after a short period of time. It doesn't go to sleep - it just shuts completely off. If I keep it busy doing something (running iTunes music or something), it will run all night with o problem.
Once it's off, it takes any number of tries - two or three, to 20 or 30 sometimes, of hitting the power button to get it to turn on. Once it's on, it's fine again. I read somewhere that there were some bad capacitors in a number of units, but thought the midplane replacement probably took care of that.
So, I'm probably looking at a bad power supply? Would that be the consensus? Is there another component I need to consider replacing as well?
Don't mind trying to replace this myself as well - what would be considered the best place to order a replacement?

You can find a power supply [here|http://www.welovemacs.com/6613350.html], but I would first look at your Console at the time the machine shut off to see whether it notes "maximum temp exceeded for more than 30 seconds" to make sure it a power problem, although I'm puzzled as to why it doesn't turn off when stressed. Also, take a look at the caps on the motherboard and see if they are swollen or oozing.
Message was edited by: MGW

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Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
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The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
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Contact Apple Support.
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http://support.apple.com/kb/TS2802
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Why my iMac 27 mid 2010 turn off by itself?
I already replaced the Power Supply part number 661-5972. The next thing is replace all the thermal sensors and then the logic board. I do not have any other way to find out what it 's wrong with it.
Last the same time that the old power Supply. Let it sit for a few hours. Turn back on and works fora few more days or weeks ans suddenly turn off again.
I am 66, started out with Apple around 87 as an independant service provider here in PR and have never had so much problem with any other mac's than this one.
Apple support provider here in PR have no expertise what so ever in giving us solutions to problems. Even thought I still doing some support to some of the old customer I am handicap with new technical tools to solve problems within new products. I wish Apple would have consideration on the old ones that help and support apple products without their help.
Thank you for reading my note!
Jose A Marrero

I can relate Jose
Have you looked under the hood of a newer car, worked on a new toaster or coffee maker..? Most all of them have sealed components that are no longer repairable, you throw the old part away and replace it with a new part or just replace the whole thing.
Heck' for the most part even the Geniuses at the bar are unable to fix or do anything about most hardware problems. So instead of trying to fix a product that is under warranty, they either send it out or replace it with a new Mac, Pad, Pod or Phone on the spot.
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It also might help to post the Consol Message for the shutdown here in the ASC forum.
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My iMac has been turning off repeateadly in the middle of a job. When it does it, I cannot turn it on again inmediately. I have to wait to next day, some times even longer. If the cable is plugged in, I cannot turned it on. I've tried everything. Changing the cable, changing the power font, etc. Some people say the problem is with the mother board. As a consequence of this, my disk drive didn't work anymore.
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T update; I get the blackout without the restarts and tried all the suggested remedies on these forums with no relief. I can see light from the grill covering the ram access port so I do not think it is fully shutdown but will not respond to any wireless input devices so I must press the power bottom on the back to restart It which it does in a normal fashion. The machine does not seem to be running hot (much cooler than my black Mackbook) . I guess I will be bringing it in but I do not feel optimistic given the posts by users who did so and did not get a fix. I think this issue will take some time to resolve. I just wanted to add my two cents.
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27-inch / 27" iMac Random Shut down:
http://discussions.apple.com/thread.jspa?messageID=11791328#11791328
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IMac G5 turns off by itself, hard to turn back on...

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