My first thing to do would be to use a canned air duster and clean out the inside of the computer - dust bunnies love to multiply in the heatsinks and fans of processors - cpus and gpus. If anything hardware fried here, I'd be more apt to believe it's the gpu - especially given that you said you were playing Sims 2 for a while (a pretty gpu intense app).
Even a very clean looking system can be hiding damaging dust in the heatsink fins, which prevents the heatsink from efficiently moving heat away from the cpu/gpu.
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