Pixelated screen crash and BSOD

failuresfails

Distinguished
Aug 9, 2011
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This is my 1st post here...

So I just buillt a custom PC, and it was running good for a day but now... when im using it, it sometimes randomly restarts with no warning. Other times my screen gets all pixelated with lines and pixel dots(colorful). and sometimes i get the BSOD... =.= Is it the video card's problem? or something else... Sometimes when I am playing games like BFBC2, SHOGUN 2, and some other games... It randomly will lock up and by that i mean i see the game frozen ctrl+alt+delete does nothing... the whole system is not responding...I just get my game with the screen what i was doing frozen up and my mouse doesnt move... After hours of searching on google i just decided to put this up because its getting annoying. Please help!!! :(

My system spec
AMD Phenom II 955 3.2Ghz
ADATA 4GB ddr3 1600 RAM
MSI NF750-G55 motherboard
600W power supply w/ 780w peak
7200rpm 200gb hard drive and a 5400rpm 300GB hard drive
XFX Radeon 6870 Graphics Card