I have searched far and wide for an answer, and I am new to the forums so please excuse me if i'm in the wrong place. I have a Power Mac G4 Cube: 450mhz G4 64mb RAM ATI Rage 128 Pro 16mb Running OS 9.2.2 All was well, working fine, however, I ordered some new RAM, and in anticipation of upgrading to 10.4 Tiger, I updated my firmware to 4.1.9, which I read was necessary. The system works fine except for one caveat. I can no longer boot from optical media. The drive still works, and in the multiboot menu (Holding option at boot) the media still appears,but when I press return, the devices disappear and it does not boot from the disc. Anyone know why this may be? UPDATE:After reading around online, it seems a dead PRAM battery can cause this issue; mine just died recently. Maybe before the firmware update. But it was still connected to mains, so it didn't immediately show symptoms. This makes sense, as a firmware update wipes PRAM. Hmmm.. I have my doubts, but I'll replace the battery and report back.