MAc is OS 9.2.2, one day the workstation would lock up on start. I'm not a MAC admin so I got out a book and it informed me to boot with the shift key and disable extensions until I found the offending files. I worked this through and found that if "Open Transport" and "Open Transport ASCM Modules" were disabled the MAC would start and run. I trash canned the two extentions and copied new files from the 9.2 install CD, enabled the extentions and tried to boot, no luck, the system boots to a backround screen, with the cursor locked but the clock works, no icons. Same as before. Rebooted and disabled the two offendoers and the system works. How do I fix this problem?