Re: Possible Graphics Card Problem on Ubuntu 6.10
It doesn't have to be the video card. Especially in this case. Don't be fooled by the fact that it's only happening with the graphics driver installed. The hardware video card driver usually involves more complex instructions due to the fact it have performance in mind compared to the 'nv' driver. Things like the Render extension, which is the one thing I would suggest you try to disable first.
Also be sure to do a memtest86 (should be in grub or on your installation CD).
Last but not least try to set your AGP rate lower (eg. 1x and move up from that). You can read about changing that in the readme file.