Blinking #1 G5 diagnostic LED. I've already tried everything I can find info on.

I have a 2005 Imac G5, non isight, that I replaced the capacitors and PSU. It was repaired and running fine for about a month when the other day, my wife went to use it. She woke it up, and was working online fine. She was then needing to print something and as we have not acquired a usb router, she unplugged her Logic USB key to plug in the printer. Then she couldn't find her cursor, then the cooling fans spooled up to a high speed and she turned off the computer with the power button. (hard shut-down) Then the computer wouldn't turn back on. Nothing. No spool up, no "bong", nothing.
I removed the rear panel and plugged in the power cord to check the diagnostic leds.
#1 was illuminated, #2 only blinked when power button pushed. OK. Possible cap problem again as this is what it did when the caps went bad before.
I disassembled the unit and removed the logic board, finding some expected loose solder joints. (those joints are tough to solder properly)  I re-soldered, all the loose joints and tested all the connections with my meter. None of the all recently replaced caps showed any sign of damage. Then I reassembled everything and reconnected the power cord.
Now, the #1 led is BLINKING. I disassembled it all again to recheck everything and also performed a voltage test on all PSU pins. All check out correctly.
Reassembled again. Same result. #1 led is blinking and nothing happens when I push the power button. I cannot find ANY accurate posts on what this means.
Please don't respond by saying "just take it to the Apple store", etc.
I need a serious Mac expert answer.

Ok. Here's where it gets even wierder. I whacked on the PSU with my hand and the #1 LED lit solid, but nothing happens whane I push the internal power button. So...
I switched out the PSU to the other one that I replaced in the course of repairing the Mac the FIRST time.
Now... Both #1 AND #2 LEDs are blinking, albeit #1 is blinking brighter. AND the fans slowly spool. The PSU is making pulsing sounds with the power to the fans being pulsed in sequence with the sound from the PSU. The pulsing is in groups of 3 to 6, seemingly randomly.
Can anybody help me?

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