Graphic Problems, textures gone wild Options

[GORANGORAN]

Hi there.
I have problem with GPU (i supouse)

problem opinion:

when i start some games(not all) the ingame menu start ok,choosing game type ok....but when the game loads and i want to start playing it ,textures gone wild ,they are not showing right,freeze,change colors,some strange dots showed ,cant play at all....

also when loading or playing some videos from hdd or demo games downloaded from net -the same problem is showed,so this eliminates laser,



the biggest problem is when playing moh airbourne,gta4....
but when playing some other games everything is ok...
i try to update,reinstall,format,change cables(hdmi,component,av)

here is some preview picture: