I got a beige G3 from work and wanted to put a bigger hard drive in it because the older hard drive wouldn't boot sometimes. So I tried to boot from the OS 9.2.1 disc, I also got from work, by holding down the 'C' key and nothing happened. I tried reseting the PRAM and that didn't work either (not sure what that does but I saw it on the apple web site). I even swapped out the CD-ROM drive with a newer working one, that didn't make a difference. I've never really used a Mac so maybe I'm missing something :?