Dell :: Inspiron 1420: Graphics Card Dying A Slow Death?

I've had my Inspiron 1420 for about a year and a half now, with virtually no problems except when dealing with Windows Vista. But, about a month ago, I was playing a very graphics intensive game and all of a sudden my screen froze, colors inverted, and it started to flash and pixelate at me. I turned my computer off, then back on, and this started happening:

I turned my computer off again and blew out all the dust I could, then let it cool down. When I started back up everything was fine again. But about a week later, it did the same thing, but for longer.

About an hour later it was fine again. A couple weeks went by and nothing like that happened again, up until about three days ago. I was playing my game again and then it started to pixelate, but I could still play. The screen would scramble, but it was almost like it would refresh every 10 seconds or so and the screen would be fine. That night, I was (again) playing my game and my screen scrambled, froze, and went to your basic blue screen.

I rebooted and everything was fine, but the next day I turned on my computer and it did the segemented screen again and when I tried to fix it, another blue screen came up saying "Hardware Malfunction, call you hardware vendor for support .....