I installed the 8600 in my MAC G4 350 AGP model in the AGP slot. I also installed a GIGA design 800 MHz upgrade. Since that time I have had nothing but problems with Keynote and the DVD player. Keynote will not run a slide show and the DVD program does not work indicating it does not support my system. I have reviewed the ATI web site and followed the suggestion to run the 10/02 update as modified 02/03 and then ran the 10.2.6 update from an image file. Net result no improvement. I have also noted that OS X will not boot properly after either using the ATI or 10.2.6 updates. The reboot after update results in a gray screen. Safe boot will enable me to get to the desk top. After much experimenting, I found that by removing the 8500 kext file after either update via OS 9, and booting back into OS X, the system works. I then add the 8500 kext file back via OS 9 and reboot and it works. Yet if I apply the updates the problem begins again. Moving the kext file out, rebooting and moving it back in and rebooting and the grey screens problem is gone but the DVD and keynote problems remain. I am at a dead end. Any suggestions would be appreciated. Rlm