All of a sudden, the screen connected to my MP 5,1 went blank. When I tried rebooting, the chime repeats continuously and the Mac wouldn't boot. I tried the usual tests: 1- option key to select other drive: no effect 2- reset SMC: no effect 3- reset PRAM: no effect 4- removed video card: apparently booted 5- reinstalled video card: chime problem reappeared 6- disconnected all USB + FW peripherals: no effect 7- removed all PCI card: no effect 8- removed video card - booted in target mode: all disks visible on host computer Based on these tests and some web search, I suspect my video card is fried. Questions: - Can you think of anything else to test? - Can you recommend a replacement video card for Mac Pro 5.1?