I suppose it's just speaking the obvious to point out it'd probably be a bad idea to put that G4 module into your beige machine, unless you're willing to take the risk that it'll murder that unit's motherboard as well. I'd consider it damaged goods unless you can possibly think of some other thing you might of done to damage the B&W's motherboard while installing it.

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Good point, I had already tried it in the beige, though. It didn't seem break anything.

I can't think of anything I did to mess up the B&W when installing the G4. When I was researching the G4 firmware block, I came across a post (on MacInTouch, I believe) from a purported Apple employee who claimed that the block was put in place because a number of Yosemites in their test lab blew their power supplies when fitted with G4 CPUs. IIRC, most of the subsequent comments discredited this claim, though I wonder if there might not be some subtle difference between the rev1 and rev2 motherboards besides the updated IDE controller.

EDIT/PS: It might be worth pulling the firewire module off the B&W's motherboard. I have vague memories of people suffering "weird" problems on those machines solving them by removing said module.

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It didn't help.

Thanks for the response, though. Odd thing... I posted this same message almost verbatim to the LEM G-List. So far, I've received two responses, both of which said to do a CUDA reset. Don't get me wrong, I'm not faulting the advice, but I thought I said that I had tried several CUDA resets.

John