I have a dual 1.8 PPC G5 power mac that I bought used about a year ago. It came with OS 10.5 preloaded but the only discs I have for it are the original system disks(10.3). I've got it hooked up to a HP 19 LCD via DVI. The other day I tried to boot into open firmware using the command-option-O-F start up command. Well, something happened cause OS X never came up, but nothing else did either. The screen just stayed blank, the fans starting ramping up and just got gradually louder and louder. I tried entering mac-boot via the keyboard thinking that maybe I was in OF even though I couldn't see anything on screen, but nothing changed. I eventually had to press and hold the power button to force the machine to quit. I'm hoping someone here has seen this before and knows what's going on because I've scoured the web w/ google and came up with diddly. p.s. other startup commands seem to work fine. For example command-V and command-option-P-R both work.