First off, does the fan, at least, start up? If not, the power supply is probably 
dead. Otherwise, try the following until you get something on the monitor:

1) Disconnect the SCSI chain and the floppy drive. Make sure everything else is firmly 
connected. If nothing else is wrong, you'll get a lit screen with a floppy disk icon 
and flashing question mark on startup.

2) Try switching the mouse and keyboard -- or try starting up without them!

3) Try replacing everything in the "bad" 7500 -- RAM, VRAM, processor card, cache 
dimm, battery,  whatever -- with the corresponding components from the working 7500. 
Do one or a few at a time, then check to see if the thing works. Don't forget to press 
the CUDA button before restarting after each set of replacements.

If none of this works, you've probably got a bad logic board plus a collection of 
useful parts for the other 7500 and the 7200.

 - Aaron

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