Desktop: HP m8330f Video Card Problem!!!?

It seem I might be having a video card problem but I am not sure. It all started this week when I would turn on my computer and the display would be funky. Everything would be big and weird colors. When I went to check the video card in the Device Manager. It said that it was not working properly and had to shut down. When I went to disable the video card, it would be normal, but then there would be no aero effect and 0 capability of game plan. I'm wondering if heat have anything to do with this.



The CPU runs at 45-50C and the video card runs at around 75-78C when idle.



I have cleaned the inside of the computer of any dust.



More info on the computer: AMD Phenom X4 9500, 3 GB DDR2, Nvidia GeForce 8500 GT, 640 GB Hard Drive, Windows 7 Home Premium.



Please Help! Thank You!|||HP m8330f has a 300 watt power supply.



Power Requirements:

8500GT 1GB models

Minimum of a 350 Watt power supply.

(minimum +12 Volt current rating of 22 amps)



8500GT 512MB models

Minimum of a 350 Watt power supply.

(minimum +12 Volt current rating of 18 amps)



8500GT 256MB models

Minimum of a 300 Watt power supply.

(minimum +12 Volt current rating of 18 amps)