Hi...could use some help. I was trying to upgrade my mini G4 from a combo (mod CW-8123) to a super (UJ-845)drive...Coincidentally, a disk had gotton stuck in the combo just before I was going to do this...the first time in 2 years...just wonder if something may be related...Anyway I got the disk out and retried the combo drive and it works fine again...But I couldn't get the superdrive to work...In fact, the mini won't boot with it in..its as if it is trying to boot from the superdrive maybe....get the folder and ? not the apple (use OS 10.3.9)..I also tried a few other combo drives I had lying around (also 8123 and they do the same thing). Are all these dirves bad? or is there some master/slave setting (didn't know there were on these) that is causing trouble or something else...The superdrive was bought used but the guy said it worked fine/was tested...the other drives I'm going to check in my ibook to see if they work there..but any ideas appreciated..thanks, rick