Thanks for the tips, Ted. The unit is currently disassembled, since I wanted to figure out what was wrong with the screen hinge. This pic reveals all:

Are replacement parts available for that piece? Or am I better off replacing the entire LCD screen?

I also have included a pic of the Sonnet Crescendo G4 upgrade board (w. 256MB of RAM), and of the IBM Travelstar 20GB (which I'm presuming to be dead since the computer refuses to boot from it; more testing required of course at this point).