I just finished building my ideal video editing machine with P4 3.06 Northwood and 2gb ram. It runs well with on board graphics and has intel 845GE chipset with the latest driver from intel. But when I come to install Geforce 6600 (256) on AGP nothing works. Mostly it won't POST - sometimes it does. By doing a lot of resets I can get to XP welcome screen before it freezes. I tried disabling on board graphics and then I had no monitor and had to flash the bios to get my graphics enabled by default. I only have a 220W psu (Its an Ice Cube) but nothing else is running except HDD and I've studied the reviews of this machine and it runs other graphics card no problem. I see others on this site had the same trouble - how did you sort it?