got a radeon x800xl and i think it may to blame as been having probs playing just cause. after bout 5mins the screen looks like a chess board with lots of squares and break up of graphics and colours. and even when i quit the game the desktop has these squares all over it,shown in pic below. and whateva i do surf or browse pc,these squares stay there until reboot
thought it may be a heat issue as it happens as soon as card put under strain.
thx inadvance


3500 xp64
1gb geil pc3200
160gd samsung HD
radeon x800xl
asrock 939dual mobo

Download Speed fan an see if it picks up your graphics card temp up.

you may have dirt build up inside your card

how old is it

have downloaded speedfan,although doesnt seem to pick up my card. all i have is this

i downloaded rivertuner,but temps seems ok at 45 degrees

right click on desktop and then properties then settings,advanced,and then there should be a tab with your video card settings and maybe even a temp reading

otherwise pul it out and look for dirt under the heatsink cover


mine was full and running at over twice the avg temp