System Hang, Radeon HD 6870, Please Help

[NeoSonic]

Hey Guys,
I've recently been experiencing system hangs & can't figure out what is causing it, after about 15-45mins the system will lock up, I can still hover over icons for a short while & then the system will hang & the screen will flash this image on the screen before the monitor goes into stand-by due to lack of a signal.

Personally I think it’s an issue with the graphics card, I gave the whole machine a good clean out & removed a lot of dust & fluff from the components but it has made no difference.

I have also used GPU-Z to check out the temps but they seem to be on a steady 41°

My components are;

Motherboard - Gigabyte 870A-UD3
Processor - AMD Phenom II X6 1090T Black Edition
Graphics Card - ATI Radeon HD 6870
RAM - 8Gb
O/S - Windows 7-64bit

If anyone has any suggestions it would be much appreciated.

Thanks

 

[simon12]

Does this only happen when gaming or whatever you are doing? Has the system worked fine with the current hardware for a while or only since an upgrade or ever since built? What PSU do you have?

 

[NeoSonic]

It does this when doing anything, even when just downloading, I have had this setup for about a year now & it's been working fine, nothing has changed recently, the PSU is a 650w or 750w

Any ideas?