Well I have had this problem with a 1 Gb ATI Radeon HD 4870 and thought it was not a Windows problem as it only ocurred when I played 3D games - 2D games were fine. The screen would dissolve into pixelated blocks, then lines would appear across the screen,
then it would crash and recover, although a reboot was required to fully fix it. Then, about nine months ago I had to put my computer into storage for six weeks. I didn't change anything and when I finished moving house I switched my computer on and to my
amazement found that the problem had completely vanished. At the time the only difference I could think of was that I had no connection to the internet or that I was using a different power point. Now, after seven months or so, the problem has returned.
I have a cooler case and have cleaned the air filters and gone through the cyle of updating all the drivers again but I think I will try disconnecting the computer from the power for a few days and see what that does - maybe the capacitors on the motherboard
need to completely discharge or something. it's wierd that it could suddenly return when I haven't made any hardware changes or changes to the video setup.
I did get a complete gaming session going last night when I overclocked the CPU a bit but the computer was back to the same behaviour as before after I rebooted. Now 2D games are affected, too, so I can't even play "Hearts of Iron III" without losing some
pop-up screens. Fortunately Windows, internet browsing, and Office are not affected. I've read every post in this list and many others and these are all the possible fixes appart from the obvious cleanup and update ones:
1. Install a third party tool like ATI tools and change the timings on the memory
2. Install a more powerful power supply. It must supply 30 Amps from its 12 watt rails and should be one recommended by ATI - all are at least 550 watts, though 650-750 watts seems best
- pull out one of my memory chips, as I am using 32 bit Windows 7 I can't use 4 Gb of RAM anyway. I have tried re
- try the TDR fix (I have Windows 7 and I have yet to try this)
- Change the idle speed using Catalyst
- install a third party utility and check for heat issues, although Catalyst reports 55 degrees Centigrade for the card - nobody seems to know what a safe temperature is though
- Disable hardware acceleration in Flash (though flash works fine)
- Change the power settings from Balanced to High Performance
- Change the CPU and memory speeds
- change the RAM voltage
- Turn off Windows Desktop Manager
12. Disable Windows Aero
- Turn off Power Play in Catalyst ( I think I've tried every Catalyst setting, they do make a difference but not 100% !!!)
- Change Display Colour to 16 bit (that will make photographs look awful though)
- Uninstall and reinstall Direct X
- Uninstall and reinstall Catalyst
So, anyway, that's a list of the possible fixes suggested so far, to which I can add, disconnect your computer from everything and put it in a shed for a while (at least it will work properly for a few months)!!!