Here's his configuration: Mac Pro 2006 Snow Leopard fully updated His computer was running a bit slow, so he rebooted. POW, he gets nothing but a gray screen. He has two monitors and one is dead, and the primary is gray. The chime sounds good, no beeps. He has four drives, 1 - Factory, 2 thru 4 - Raid. He had a Mac Pro 2008 in his garage. He pulls the drive from his garage model, removes his primary drive from his dead computer and successfully boots the garage drive in the DEAD computer. Great right? So he then shuts down. Puts his dead drive in Bay 2, removing drives 3 and 4, so only two drives in...the garage one that JUST booted great, and the old DEAD drive in Bay 2. He restarts. Now the garage drive won't boot. No biggie right? He moves his garage drive back into the Mac Pro 2008 model. Oops! Now it won't boot. Could the CPU be eating drives without any chimes? He tested his DEAD drive in the 2008 model, same thing, DEAD. Any ideas? I've been working on Macs forever, and I've never heard of this problem. I should add that the system won't open the CDROM drive during a USB mouse left-click down. It also won't allow him to reset his PRAM. He holds the keys down, and nothing, and that's on both models. It was my understanding that PRAM resets and CDROMS open even if the system fails to find a drive. Too, his system never shows the dead folder. How is that possible?