Did you say you got a G3 card in the machine. That takes a peice of software to run and if the HD is messed up nothings going to happen.

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Software for processor cards in PCI power macs is not *required* since it replaces the original processor. It will run just fine, except Apple System Profiler may not display the correct speed or processor type.

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I have a 8500 with a G4 carrier ZIF..that if you boot from an external drive without the XLR software all I get is a grey screen. Restart several times it will boot up. But when you boot back to the 8500 drive nothing but grey screen. Ive had to swap out to a 604 card before to get it to straighten out. The preferances get messed up.