Suddenly started having probs with the combo drive on my 600MHz iBook. First noticed that sometimes when the computer would wake from sleep, it would be locked up. Forcing to shut down then restarting, it would give me the Finder/Question Mark "can't find startup folder" icon until I finally tried restarting with the CD tray open. Don't ask me what made me think to try that, but it works consistently. Now it looks like I have to run my computer with the tray open. If I close it, with a CD in it or not, I get the spinning beach ball until I force the drive open (paperclip method), when the computer will eventually come back. If I try this with a CD in the tray, I don't hear the disk spin and there's no evidence of it in the Finder. Has anyone else had a similar problem? Any guesses if it's a hardware or software problem? Thanks!