Power supply vs. logic board? turns off in sleep mode.

My imac g5 (2004 - 1st generation?) is either turning completely off or going into some un-wake-up-able mode after it's put to sleep. (I have to switch off/on the power strip and turn the computer on all over again.) And sometimes if it's sleeping (power light pulsing on front) it may or may not wake from sleep by pushing the power button. Often touching a key in that circumstance will cause it to crash, so I've quit using that altogether as a method of waking it up. I've reset the SMU a number of times throughout the past few months and it has not cleared up this problem.
Last night after I put it to sleep it switched in to the un-wake-up-able mode. I could still hear something running (not a fan, just an electrical hum) where it seems like it's crashed and can't shut itself off. I had to turn off the power and try to turn the computer back on. It wouldn't respond the first couple times. Then the power light glowed for a while but it still didn't turn on completely. After a few more minutes I tried again. Maybe I held the power button for too long, but I heard a long single beep, the fans whirred, and then everything started up as usual.
I've read a number of threads seemingly related to these issues, but am now not clear about whether this is a power supply issue or a logic board issue. I have yet to open the back and check for bulging capacitors. Just thought I'd ask here first.

I am having a very close issue too (posted also in a more recent thread about power button not functioning). My old iMac G5 20 inches got a power supply that went bad two years ago. I had it replaced and all went fine until two weeks ago.
My wife was using it, while I was away: machine shut down with a 'pop!' sound.
She tried to start it up again, but after pressing the button a couple of times - the last one longer - she had a long strong peep. The machine went on for a while and then off again. Scared, she left it off.
After checking, no reported issue seems to fit to the problems shown: power supply is working; logic board too. The machine is working fine, but on sleep, it dies out. While doing tasks, at undetermined times, it shuts down with a 'pop!'. Sometimes you can restart it immediately. Sometimes you can't and have to wait one or more hours. No evidently bad caps on board, led check returns 1 (no 2 flashing or attempting to turn on) with dead computer, otherwise all working fine. Hardware test also passed. Console messages have nothing relevant or clearly understandable to offer.
Still can't figure out a solution. Many user are pretty fast in suggesting to bringing the machine to Apple. Unfortunately not all around the world we have/need cars. And getting the 20 kg of iMac by feet/metro to the shop it ain't such a nice walk. When I fried the power supply, there was no sufficiently large box on sale to pack the computer and have it send to the shop. I had to wait for the technician - on a convenient day - do drop by and take it (and he knew he was going to repair it)!
Will post, if I have further developments.

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What do you think-Power Supply or Logic Board??

I came across a used dual 1.0 GHz MDD G4 that will not start. When the power button is pressed, the power LED will light and then go out. There is no chime and the fans all come on incredibly loud and fast. The logic board has a small red LED between the CPU and RAM slots. Does the red light mean the board is working or good?
I've swapped CPUs and got the same result. If it was a power supply issue, would the fans and logic board power up like they do? I've put a disc in the drive and can hear activity, but nothing ever happens. Also the power supply looks to be smaller than the other MDDs I've used. It also has a large separate fan at the end towards the front/speaker area.
At the same time since the logic board has the red light, it would seem that it's working also. Right? I just need help deciding what to replace next. Thanks in advance.

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Power supply or logic board failure

First time post, long time Mac user (since 1983). My older iMac G5 1.8 GHz Power PC (ALS) occasionally fails to start when I press the power button or the internal power button on the logic board. The only solution is to unplug/plug the external power cable where it meets the power supply housing (not at the outlet). None of the capacitors seem to be bulging on the logic board, LED1 always lights up, LED2-4 fail when there is a problem but are normal after unplug/plug routine. Noticed that there was no internal Lithium battery where one is supposed to be, but this has been the case for 5 years, so this is probably not the issue. I suspect the power supply. It's an old iMac with plenty of leg left and will be used as a second computer in the home. Any ideas? I don't have a volt meter, but am willing to get one if the test points are easy to get to (I'm not an electronics wizard).

Welcome To Discussions - If resetting the SMU, which is in effect what you are doing, solves the problem and the caps look ok, then the prime suspect would be the power supply unit. They are not expensive, check out [synaptech.com] for prices or[welovemacs.com] whcih will also give you instructions on how to replace it.
It would probably be a good idea to replace the battery it's CR2032 3 volt lithium button, easily obtainable at Radio Shack or similar places.
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Power supply or logic board?

We had a funky power failure last night, and now my iMac G5 (17", 1.8 GHz, about 2 years old) is dead. Push the button, nothing happens.
I opened the case. The #1 LED is on, but it's not on solid. It's varying in intensity at a rate of a few cycles per second. Not really flashing on and off, but flickering. I've never noticed that before--I thought it was on solid when I've looked previously. Am I right about that?
The internal power button and PMMU reset button have no effect. Also, if I put my ear close to the power supply, I hear a "chirping" noise.
Any thoughts? I'm guessing it's the power supply. Any ways to test it aside from substitution? I have voltmeters and an oscilloscope and know how to use them, but I don't know where the test points might be.
TIA,
Neil
iMac G5 Mac OS X (10.4.8)

rbneil-
Take a look here.
It sounds like your power supply is dead. Apple will
repair it under the extended repair program if you
are covered.
The light should be on steady from what I remember.
That is a clue for sure.
Luck-
-DaddyPaycheck
Checking the link, it seems that the recall program only applies to the 20" model. Mine is a 17". Are you aware of Apple extending the warranty at all on that one?
Neil

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Power supply vs. logic board? turns off in sleep mode.

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