Screen goes black/white + noise, during games

I'm not good with computers, so that's why I'm here. I have Windows 7 Whenever I try to play a game (example: Sims 3) my computer works, but then suddenly it's like the screen shuts off. A variety of things have happened like the screen would go black, then it would come back on, or sometimes go black like three times in a row until it eventually shows the 'No Signal' block or sometimes 'Input not supported'. Or what has also happened is the screen went white and made a terrible sound, sometimes it's a bunch of colorful block stuff while it makes the noise. I've had the computer for about 6 years now and I've never 'upgraded' anything on it. Can someone help me out because it's driving me insane. Can it be my graphics card?

Computer system information:
Processor: Intel(R) Core(TM)2 Duo CPU E6550 @ 2.33GHz 2.33GHz
Installed memory (RAM): 2.00GB
System type: 32-bit Operating System
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  1. same happened to me n d prblw was overheating maybe urs tooo
    playing hugh graphical games req. More calculations requiring more energy leading to overheat so my suggestiins are cool down ur pc by adding fans etc. Or keep in ac room or ipen ur cabinet while using ur pc
    and dlnt forget to ckean up existing fans cause dirt may have reduced ur existing fans rpm good luck n sry abt my english
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