Before I start explaining my probelm
Here is what I have
Asus P5Q mtherboard
ATI Radeon HD4850
I run windows 7 32 Bits
Now about my probelm : My PC crashes and stops responding and the monitor shows colored Vertical lines , this happens while I am playing games , there is no specific time or place in game where it happens
it just happens randomly and I have to shutdown my pc from the power button.
I was having this probelm last year and I solved it by changing the fan with a new and big one.
I stopped playing for a while.
Then I started playing again this june
I played Splinter Cell Conviction without any problem
Then I installed Split Second Velocity and there it was Vertical lines with diffrent colors (sometimes green and brown or brown and white or....)
and then I played Battlefield Bad Company 2 with no problems
Then It occured in Need For Speed Shift and now it is happening with Prince Of Persia the forgotten sands.
now I'm confused what is causing it
I found out that graphic card overheating is not the probelm (46°c Idle and 69~70°c at gaming)
PS: Please do not suggest me to buy/replace or change the graphic card
PS:2: Sorry for making my post too long and English is not my first language so I'm sorry for any mistakes