Well, the PowerBook CPU arrived. The system now powers on, chimes and begins loading the Mac OS. I can hear drive activity and the volume adjustment tones as I hit the volume keys. However I have no video. Not just backlight, but absolutely no video.

It worked before I placed it into storage. The only part that has been changed is the processor card. I have reset the PRAM and PMU. Still nothing. I'm attempting to test with an external display but don't get anything there either, although I could be doing this incorrectly and not entering Clamshell mode correctly.

EDIT: Fixed it. One of the pins in the processor connector block was slightly bent. After managing to get it absolutely dead straight, the system now displays video on both the internal and external displays.