New iMac G5 PSU/Logic Board Problems

Hi, I just got a new (old) iMac G5 for $30 and thought, "Well, even if it is broken, at least it comes with the new expensive keyboard/mouse" and so brought it home.
When I plugged it in and first powered it on, it went like normal; the fans started, the sleep light went on, then off, made the power sound, but it didn't power the screen and made a sound before everything but the fans went off. So I unplugged it and plugged it back in to see if it would do it again, but all it does now is make a quick high pitched sound then nothing.
I checked the capacitors and the LEDs on the logic board and they tell me it's the logic board (only LED 1 ever goes on), but the faint smell from the PSU and high pitched sound make me think it's the power supply.
What I want to know is which one is most likely broken, because my plan for the computer is to get it running as cheaply as possible and make it into a nice multipurpose family computer (and it still needs a HD and HD tray). If someone who had a broken logic board before tell me what it did when they tried to start up the computer, it would be helpful.
Anyways, thanks to all in advance, and I know I hight find a better iMac on eBay for the same price as the repairs, but it already saved me $70 for the keyboard and mouse, so I thought I might as well fix it up.

Hi, zzloewrider
_"quick high pitched sound"_ -- i think this sounds like the PSU. The LED diagnostics is a bit misunderstandable in that that it says, when the 2nd LED goes shortly on, then it's the PSU, if it doesn't go on, then it's the LB. In fact, the time during which it goes on, can be VERY short, and badly visible in daylight. Thus, you might have luck that its the PSU, not the more expensive LB. The sounds is that what i remember from my PSU failure as well.
Do you have access to an oscilloscope, or at least to a digital voltmeter? You could try to check the voltages the PSU delivers (the oscilloscope gives you in addition information about stability and spikes). if the PSU delivers unstable voltages, then you know whose fault it is. You might even try then to correct it, possibly by replacing some of the capacitors.
Have a look here: http://www.jimwarholic.com/2008/11/apple-imac-g5-power-supply-issues-and.php
Success!
Thomas

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