I just got a hand-me-down Mac Pro at work to replace my 1.8 Dual G5. Yay! The problems started after I transferred my data and tried to wipe the drives in the G5. It has a 160GB as the boot drive and a 250GB as a storage drive. I tried booting to my Leopard DVD to erase the drive, but it wouldn't boot to it. I eventually figured out the Superdrive had gone bad in it, so I found an external USB DVD drive. The problem is it will read my Leopard disk in the external, but will not boot to it. My guess is it won't pick up the external fast enough to boot to it. Any ideas on how to get this to work? Also, I never had the original install disks, which is why I'm using the Leopard disk. It currently has 10.5.8. Secondly, I decided to wipe the second drive. Every time I try to zero out the drive, I get the error "Zero disk failed with the error: Could not unmount disk". Any ideas on either one?