Well, this is essentially a repost of Left Hanging, but this time with new information. The last time my computer locked up, there was something new.

Shown below is a cap of the error message that my computer displayed for just long enough for me to dump it to a file, before another lockup.

Having done a wee bit of research, apparently the nv4_disp error is commonly associated with a BSOD on startup, which I have not been experiencing.

Any new ideas based on this new information?

Oh, and for the record, I'm running the most up-to-date Nvidia drivers.

Have you tried unistalling th graphics driver, then rebooting and installing latest driver from Nvida

In future please don't start a new thread.