If it helps with figuring out what the problem is, I have the same thing going on here, too. Same chipset in a Compaq Presario SR1750NX (specs here: http://h10025.www1.hp.com/ewfrf/wc/p...roduct=1815877
) and the geForce 6200 TurboCache PCI-e card installed. I'm using Ubuntu 6.10, and with the latest drivers enabled the computer will usually lock up within 10 minutes, whether or not RenderAccel is enabled. If there's any other information I can provide that will help, just let me know.