Well assuming that's a screen grab and not a photo, then we can at least rule out your monitor.
You could try rivaTuner and see what your temps are (Furmark - free download - will give you these too and is also a good stress test). If they're too high, try running with your case open and/or checking your card for dust.
If your card is well-ventilated and running hot, it could be dieing.
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