I have begun upgrading a friend's computer. It is a Blue and White G3, with a 500 MHz G4 upgrade. I installed Panther on it, and it worked just fine. I then upgraded to 10.3.5 (combo), and it rebooted just fine. I then installed QuickTime 6.5.1, and rebooted again. The screen went into 800x600, and showed the Apple logo. A few seconds later, the screen went into UNIX, and displayed a message that said "Darwin kernel 7.5.0" and the date. The system was frozen, and the screen was half-scrambled. Holding down the shift key did not work. I rebooted with an OS 9 CD, and it booted just fine. Something interesting happened next: the resolution stayed at its native 1280x960 when it showed the Apple logo while booting OS X. It seems that the machine will only boot when the resolution during startup is 1280x960 When the bootup resolutuion was 800x600, only OS 9 would work-- not even the OS X INSTALLER CD!!! It gave me the same error, only with "Darwin Kernel 7.2.0" The Specs are as folllows Blue and White G3 Sonnet G4/500 ZIF Upgrade Maxtor 40GB HDD 7200 RPM Apple Studio Display 21" (the blue one) OS 9.2.2 Otherwise factory config Disk First Aid found nothing... Any ideas?????