Hi all,
This very first message to try to answer the last post (I will later make a more complete post about the repair of a FSIQ3 unit that we had at work).
On the FSIQ that I did repair, the CPU board was also faulty (same behaviour as paul above. Power up but screen stays black and nothing else).
After some long 'reverse' of the board, I found that there's a small PIC16 microcontroller underneath the HDD (you must remove the drive and caddy). Long story short, This PIC16C has a 4MHz resonator that was dead on my board. I replaced it with a new resonator and the unit started again (more details in the post I will do to share all the things I collected during this repair).
I hope yours has the same fault (to ensure, simply sold a wire to the resonator pin next to the LT1431 SO8 chip, close to the PIC16C, and hook a scope. If there's only a flat 2.5V, then the resonator is dead).
Regards, Jerome
P.S : I'm trying to find a way to enter BIOS, does anyone succed doing this ?