Interesting..explain how I would not be getting enough power to the Video card please.
I don't know what kind of video card or power supply you have but you need to have a power supply that puts out enough power (total watts and +12V amps) to operate your system and your video card. Modern video cards consume almost half the power in a typical system.
As examples a Nvidia 9500 GT needs about a 350W PSU with 16-18 amps on the 12V rails. A 9800 GTX needs 450W with closer to 28 amps and those numbers are minimums. If you're running a lot of hard drives, peripherals, an extreme processor, etc. then the numbers go up.
We run into this all the time in the Harware and Software forum. 70% of those wanting to upgrade their video cards also have to upgrade their power supples. If they don't they would either fry the video card, the power supply or both.
Heat exacerbates the issue as heat reduces the efficiency of both the power supply and the video card so simple summer temperatures could cause a failure in a system that's already on the edge.
You might want to take this discussion to the Hardware and Software forum for additional opinions.