Hmmmm.. I mean, it could have been a coincidence that both boards died the same way (and other users reporting abnormal operation), but I'm just not willing to trust that G4 in my 3rd motherboard ( They're getting a little rare now-a-days ) I think I'm probably going to sell it, no idea why I even hold onto it. I'll be more than happy to trade it for a 1ghz, or 1.1Ghz Powerlogix G3 upgrade

As far as the CUDA issue, I never really use the CUDA, except when all else has failed, just never had to. I assume it's the CUDA reset switch you're referring to? The CUDA switch has always been just a bios clear jumper for me and nothing more. Press it in for 30 seconds or so and everything should be erased from the NVRAM. It really doesn't do anything else, as far as I know :-/

Oh well, best of luck.