So I've been using macs pretty much all my life, but something just happened to my girlfriend's laptop that I've never seen before. She's got a 15" Powerbook, the last ones that were made before the MBP's came out. Here's what happened: we just finished watching a DVD, i turned off the computer, then I realized i left the disk inside, so i started the computer up again. We don't get usual start up chime, instead we hear a simple loud beep, followed by a white screen with some text on it. We kinda panicked, so i don't remember everything it said, but it was asking us to either type 'mac-boot' to start up or type 'shut-down' to turn it off. The fans whirred up real fast too. It kinda reminded me of doing a firmware update or something strange like that, or it made me think that maybe I had held some strange combination of keys down while starting up, but there was nothing near the keyboard when i started up. Any ideas as to what this was, and whether its something we should be worried about? Either way, she's backing up her important stuff right now. Her hard drive is pretty full, i dunno if that could cause problems. Something like 10 gigs free out of 80 or something. Thanks for your help.