For 2 weeks I was playing Half-Life with my new CL Graphics Blaster without mishap and it ran like a dream. Then, I overclocked the card and tried it. Now the startup screen and game are just jumble. Even when I clock it down it doesn't work. Card isn't getting hot nor is the inside of the case as I've gone to great lengths to make sure it stays cool. And, the fact that it was working before is mysterious. Any suggestions?