I just thought that I would let everybody know that I was able to install Mac OS X 10.1.4 on my Umax Supermac c500. I used a Mashua SCSI CD-ROM Drive to do it. (It's still doing it, when its done, i'll take a look at the model number.) I still have to get the Sonnet Crescendo G3/L2 Cache Upgrade working though. Any suggestion would be greatly appreciated!