Crash to fuzzy sreen

I have had a stock Asus desktop PC M51BC for about 6 months and it crashes to a fuzzy screen
this began about 2 months after I got it and it has been happening a lot
it happensoon when ever I try to load midres 3rd objects in games such as team fortress 2
now it seems to only run for about 10 seconds be for it dies
I'd like to note that I have it set up with out a 3rd prong or no ground
 
Does this issue occur other than while gaming?

I want you to try a very low tech diagnostic step. Find a small fan, open your system's side panel, and on the fan's low setting have it blow directly into your case.

Now start up your system and play Team Fortress. What are the results?
 
Does this issue occur other than while gaming?

I want you to try a very low tech diagnostic step. Find a small fan, open your system's side panel, and on the fan's low setting have it blow directly into your case.

Now start up your system and play Team Fortress. What are the results?

It ran for about an hour and then it crashed and also it never happens without rendering 3rd
 
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