I have an iMac G4 700 flat-panel, and I just bought tiger. I'm currently running jaguar 10.2.8. When I try to install tiger, the computer states that a blank dvd has been inserted, and wants to know what to do with it. Holding down 'C' with the disc inserted during reboot doesn't work. The computer ejects the disc. The iMac has a combo drive. (dvd-rom) Also, the drive will not play a normal dvd movie (comes up with an error). I have 1 gb of ram on board. Any help would be greatly appreciated. **NEW** I've been investigating, and it seems that there are a lot of users experiencing problems with their combo/superdrives. Some state that it occurred after installing updates, others think it's a dirt issue. I'm going to take the thing apart when I get home and see what's up inside. I think this is a problem on Apple's end, and I wish it would be addressed. Concerning one of the answers to my post, when a manufactured dvd (Disney) is inserted in my drive, after a long time, a box appears with 'fatal error' in it, and there is a white exclamation point in a red field. That's from my recollection, I'll try it again later. Thanks for the replies.