Is my graphics card going bad?

I recently got a HD6850 and a Phenom II x4 from I installed them and it was all fine until yesterday. I was playing COD Black Ops and my computer did a weird graphic thing like a billion little frames out of place and then I got a blue screen and my computer did an automatic restart. It was working fine until today when I started playing COD again 15 minutes into the game the same weird graphical effect happen. But instead of a blue screen the computer just did a restart again but when the motherboard image pop up instead of been its normal color green it was a weird color like white and yellow. This is the reason why I think the graphics card is not working right.

Also I'm also worried it might be the new CPU but it only happens during games and always a graphics glitch. So what do you guys thing it is and what should I do about it.
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  1. I think that the problem is more likely to be the power supply.
  2. Can you give us the specs of your computer please? PSU and such
  3. Window 7 64bit

    ASUS M4A78T-E AM3 AMD 790GX HDMI ATX AMD Motherboard

    OCZ ModXStream Pro 700W Modular High Performance Power Supply

    G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333

    Western Digital Caviar Green WD6400AACS 640GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

    AMD Phenom II X4 955 Black Edition Deneb 3.2GHz

    ASUS EAH6850 DC/2DIS/1GD5/V2 Radeon HD 6850 1GB 256-bit GDDR5

    ZALMAN 9500A-LED 92mm 2 Ball CPU Cooler

    This is pretty much my PC right there.
  4. BTW preview Graphics card and CPU were a HD 4850 and a Phenom II x3. (had no problem with that since I got it like 2 years ago.
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