I have a HP Pavilion dv6000 equipped with a NVIDIA GeForce Go 6150 chipset graphics card, and I'm not sure if this is the proper term for it but my brother says it is so we'll go with it, but the video card apparently "takes a ****".

Assuming this is not the right term I'll explain what happens: The video card picks a rectangle of pixels and tiles it across the entire screen, simultaneously the laptop locks up and you are forced to reboot using the power button.

I got my entire MoBo replaced already because of a bad video card (under warranty), before the problem happened but not as often as it does now. Does anybody know the cause of this?

I was suspicious of the temperature but it occurred at ~60C last time and my video card has gone up to as much as ~90C I asked HP for the maximum temperature for my specific video card and it's ~100C. I also have a Thermaltake laptop cooler running under it. Help please?