Hello! I tried to install a GTX 650 into my Mac Pro, but it didn't boot or chime. It didn't make weird noises. I removed the 650 and the PCI cable and reinstalled the original card, but it still won't chime. Thats about all I know. I can't do a PRAM zap since it doesn't supply USB power, it hasn't booted that far yet I guess.
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