Problem: Blinking power "on" light on front panel.

Diagnostic LEDs: 1 and 7 Illuminate when powered up (LEDs 6 and 8 are missing, not powering ON).
LED 1 Okay, we have trickle Power
LED 7 Okay, all Power Rails Okay
LED 8 - Not okay - EFI done loading
LED 6 - Not okay - EFI has configured the graphics card

I have tried two other logic boards, an alternate video card, and another power supply - ALL THE SAME RESULT - NO LED 6 or 8, No start up. Have removed and reseated ram and ram riser cards, and the CPUs (when testing alternate logic boards).

Bad CPU?

Anyone seen this behavior?

Where can I get the CPUs tested or replaced?