IMac G5 ALS not booting with new power supply and perfect capacitors

Hey guys. Just got this beauty yesterday for cheap. Came with the box, 2 of 4 Styrofoam inserts, the manual, the power cord, and the keyboard.
I was told it has a brand new power supply. When I plug it in, LED #1 on the motherboard comes to life. pressing the power button does nothing. I have tried everything: blowing out any dust, reseating all connectors, booting without RAM, adding a hard drive (did not have one), removing the optical drive, modem, and BT/ap card. The only sign of life is when I press the internal power button, and the light flickers. This is promising.
I did notice when it is plugged in, there is a high pitched whine coming from where the LED is. I hope this is not causing the problem.
All capacitors are perfect, and not burst or leaking. I had a 1.25ghz eMac with bad caps, so I know what they look like.
I removed the motherboard, and there is no sign of any fried component on either side. It looks like a brand new machine basically.
I was thinking of just getting another good logic board for it, as they are cheap, or ask a friend to recap the board anyway.
Anyone here know what could be wrong with it? I hope I did not just waste money on this. It was relitively cheap though.
Specs:
iMac G5 Revision B Ambiant Light Sensor model
1.8ghz G5
512mb of RAM
combo drive
no HD (had 160gb originally)
airport/bluetooth combo card

Hey Lam,
The only sign of life is when I press the internal power button, and the light flickers. This is promising.
I did notice when it is plugged in, there is a high pitched whine coming from where the LED is. I hope this is not causing the problem.
I'm with Miriam on this one. That "new" supply sounds bad. Look very carefully inside the power supply (through the little perforations in the case) I'll bet you see caps w/ the same domed tops like you've seen before. That whine is also a symptom of a bad PSU. It's not even strong enough to power the soft start.
I've seen 2 20" and 3 17"ers recently. Replaced caps on 3 of the PSUs and got one to work on a 17" that belonged to a teacher so that went back. Swapped the working PSU from one of the 20s w/ a bad GPU into the one w/ a bad PSU. It's working but in a place where I can keep an eye on it since I don't trust it since the caps don't look good.
I've done this hack:
http://gallery.me.com/iamkimc#100033&view=grid&bgcolor=black&sel=12
and can get all the iMacs to work that way. Advantage - cheap, totals 1/3 or the replacement Apple part (used). Con - boxes outside the nice iMac case.
The auto laptop supply loads the Sparkle down too much for the 20" however. I'm working on finding an auto supply that saps less Amps or a simple voltage doubler for the 12V supply to solve that problem.
The ATX hack is pretty simple and only requires switching two 12V leads. Oddly one of the early versions of the 17"ers ran fine without the 20V inverter power. Go figure.
Richard

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Please have a FANTASTIC day today!!
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Message Edited by BSU Dude on 04-29-2009 08:38 AM

Do you remember that post about creatind a resistor connector to bypass? I have a fan not detected eror with my new PSU on the DC5750.

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