IMac iSight G5 will not power up

Here's what got me here...
I installed a 500 gig drive about 6 months ago maybe. Annoying and time consuming, but everything went fine. Well so I thought anyways. In the last couple days, I began experiencing random freezing and kernel panics. I suspected a HD issue, but everything said it was fine, no problems. Tried zapping pram and the usual stuff. Then I had problems just getting the machine to turn the screen on much less show me anything at boot.
So I ran the hardware test at this point when it would finally behave long enough to run it, and it gave me a FAN2/4/8 : HDD FAN error. So I tear the computer apart tonite to see what's what, and turns out, i forgot to plug the fan in the last time I was in there. Odd that it took 6 months for it to start causing issues, but whatever. Plug the fan back in, blow the fans out quick while it's open, put it back together, and it turns on for a couple seconds and then quits.
Hmm. So I do the SMU reset jig a couple times, nada. Do the SMU reset while holding the power button. Nada. Apple cleverly hid the leds on the board under a black piece of plastic. I can't find anything on the led's inside the isight model, but if they are the same as the older generation, green led 1 is on indicating power to the board. Green led 2 comes on after pushing the power button, but goes out after a few seconds, and a red led 4 comes on, and stays on. This reads as the power supply being unable to supply sufficient power to the machine, if going by previous model's guidance. At no point does the machine reach the chime stage. Nothing is attached to any ports, no mouse, no keyboard, no nothing.
Power supply, or logic board?
Yes, the machine was out of warranty whem I put the drive in, so there was no warranty to void.
No I don't have apple care. This is the first mac to puke on me, and I've had lots over the years.
Yeah I probably cooked something without the HD fan running, stuff happens, but what got cooked?

What can get cooked is the motherboard - but the power supply could also be faulty. Your best option is to take it in and have it looked at, if you feel competent enough to replace those components (we won't mention the debacle with the drive ;-)) you can order them online and DIY, otherwise, let the Apple service provider do it.
Let us know how you make out,

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IMac iSight G5 will not power up

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