I just upgraded my PowerMac 9500/200 to 9.1 from 9.0.4. After carefully reviewing ALL the MacFixit stuff and the applicable comments from MacNN bulletin board, I had a FLAWLESS upgrad--not one glitch. I did a clean install from the CD and then merged with Conflict Catcher 8.0.8. Thanks to this bulletin board I upgraded appropriate software prior to the install. THANKS!!!!! If anyone has a PowerMac 9500/200, I'll be happy to comment with any questions.