We shipped out a mac pro a couple of weeks ago, and somewhere in transit it managed to die. The diagnostic LED for CPU B lights up, and the fans spin, but that is it. No video, no chime, no beeps... nothing. We tried swapping CPU's, and no matter what CPU is in socket B, it is reported as bad, and the machine does not boot. There appears to be physical damage to the pins in that socket, so it's time for a new logic board. Does anyone have any suggestions for a source for this part? (The Apple part number is 661-3919) and the cheapest I have found it online is $699... Any suggestions that might beat that price?