You could try booting into Safe Mode which ignores the video drivers anyway, which seem to be causing your problem.
To get into safe mode, hit F8 repeatedly as your computer is booting up.
By the sounds of it, your drivers are trying to run the vid card too hard for the lack of power that it is getting, even without it having to process 3D stuff.
Intel E6750...........PSN: ELBATROP
XFX nForce 650i Ultra
Patriot PC2-6400 8GB (4x2GB)
36GB WD Raptor
Samsung SyncMaster 931c
Samsung SyncMaster 750s
Windows 7 Home Premium 64