Issues with HD 6850

[leviwar]

Every time i play a game for about 5 mins i get a blank screen with blue vertical lines here is a picture
http://img121.imageshack.us/img121/8999/ati5870chrash.jpg

This happens quite randomly and i am very fed up with this because i cant play games on my machine i have tried deleting the drivers and installing again, i even brought a new fan for my pc this is not a overheating issue my temps are fine i have even tried disabling the ATi HD audio device still no luck Does anyone know how i can fix this?

 

[leviwar]

its a Ati HD 6850

Quad core 3.2 ghz
4gb ddr3
720w psu
gigabyte motherboard

Idle temp 38-42 'C
Gaming temp 52-58

playing battlefield 3

 

[leviwar]

no battlefield 3 is not the only game its happend on Crysis, borderlands battlefield bad company 2
i am not sure if its the cable or not. I have the latest drivers yes

 

[leviwar]

i saw a baking method i am going to try that next

 

[leviwar]

dont worry i didnt try it just did more research, apparently its the RAM someone also said to upgrade the bios i have so now i will try out bf3 and give you results!