I've been working on this for hours, logic board in and out of the case, reflowed the slots, surrounding ICs and the G5 System Controller ASIC. I just can not make this computer run.

I'm just about to concede defeat to the faulty logic board. Short of a replacement board I don't think it'll run again.

The Power Supply is good, as is the graphics card, memory, processor, drives, all the fans and sensors... so it's worth something I suppose. I'm not sure i'm prepared to cough up the $120 or so for a replacement board from Powerbook Medic, but it may be the only option if the system is to be repaired.

EDIT: As soon as I finished typing out this post, the computer chimed and started up. I haven't a clue what this machine is doing.

EDIT2: It's the G5 System Controller ASIC. If I apply pressure to the underside of the board directly below that chip, the computer will start up every single time. I'll keep the 68kMLA informed of any further developments. For those that aren't aware and would like an explaination as to what i'm referring to when I say the G5 System Controller ASIC, i'll turn over to Steve Jobs.

http://www.youtube.com/watch?v=ve3O6VtBmdc - Skip to 8:20.