I always go to MacRumors for advice. MacRumors' members seem to know everything. Here's a new challenge: Recently, I bought a used 333 mHz iMac, so I could use a few old MIDI programs that I own. Wanting to check it for any problems, I inserted a copy of Norton Utilities 3.5 in the CD tray. The iMac would not recognize it, even though the OS is 8.5, and Norton states on the CD that it is for OS 7.1, or above. Here's the stupid thing that I did ..... I decided to switch my start-up drive to the CD drive. (I guess I was hoping that, for some miraculous reason, the CD would be recognized this time.) Well ..... the iMac still refuses to recognize that CD, and now I can't start up my iMac, because my start-up drive is my CD drive! Here's where you come in ..... And I KNOW that (after you've ridiculed me just a bit) you'll give be some great advice ..... Since I can't start up my iMac, how do I switch the start-up drive while it is booting? I'll keep checking, to see the posts. Thanks, so much, in advance.