I have an Intel Mac mini (purchased in 2005 or 2006) with a fresh install of OS X Leopard on it. I recently changed the Startup Disk in the OS X system preferences to be the CD/DVD drive, and everything has gone downhill since there. I inserted a CD and attempted to boot from it right after changing this setting. I noticed the CD drive spun up the disk, but after waiting several seconds a black screen appeared, saying "No bootable device — insert boot disk and press any key". There were two problems here: first, the CD never ejected from the computer, and second, there was no response to any key press. After restarting and shutting down a few times I got the Mac to spit out the CD somehow. I restarted, inserted the same OS X Leopard disk used to install the operating system earlier that day, and got the same "No bootable device" error. So, there seem to be two (possibly-related?) problems here: the Mac is not taking any keyboard input, and will not boot from even valid, definitely working CDs or DVDs. For the keyboard input: I've tried holding down, tapping, and intermittently holding the C, X, D, T, and Option keys (suggested in ##mac last night) during the initial boot, with both an Apple aluminum keyboard (which is working fine as I type this) and an older wireless USB keyboard. I have plugged each keyboard (on separate occasions) into each of the 3 USB slots, without any effect. For the boot: Booting headless made no difference, nor did the insertion of a Debian CD, Ubuntu CD, OS X Leopard DVD, or Tiger DVD. Has anyone experienced either of these problems before? Could they be linked, since both appeared after messing with the Mac's startup disk? I have made no hardware modifications—I haven't opened the case at all, in fact—since I got the Mini. I'm thinking about taking out the Mac's hard drive, wiping it, and then trying to boot… any ideas?