   Wierd Artifacts in Steam Games (DOD, L4D)
  I'm getting some horrible visual problems when I play Left 4 Dead. Triangles appaear out of no where and block my view to an extent where it becomes unplayable. Here is an image of the problem.For a few reasons I thought it was due to my video card overheating. However I just cleaned out all the dustbunnies from the fan and heat sink and I'm still getting this problem. I also just updated my drivers and that didnt help.I've had the same video card and computer for over a year, but this problem is new in the last month.  Any ideas what it is?On a related note, who wants to play some left 4 dead when I get this fixed?! :)   
  I've only ever had that problem in games when I have my GPU overclocked too far / overheating.  Of course, I don't play the games you refer to so maybe it is a bug of the game?   ;  Some pointers from the top of my head:*) Try switching to the DirectX Retail runtime if you are running on debug.*) If possibly, try to downclock your GPU (to find out if it's a heat issue).*) Lower the graphics settings of the game (again, to find out if it's a heat issue).*) If possible, try swapping your GPU with a different one.   ;  Sometimes the GPU fan will not spin up to full speed properly and will overheat as a result.  This happens to me a lot with my 8800 GTS.Try getting some fan-control software and set the fan speed to 100% and see if that helps any.It could also be caused by a dying power supply.   ;  Thanks for the replies. Im still having this problem :(Overheating: I dont *think* my card is overheating. I say this because the video problems start as soon as I start playing, so theres not really time for the card to heat up. Also, Ive had this card for over a year and this problem is fairly new. Also, I cleaned out the dust from the heat sink on the card, and this would make it run way cooler anyway. My card is a Radeon X800 and unfortunately the software/drivers for this particular card doesnt have any temperature monitoring feature. Also I turned all the video settings for the game down to minimum and that hasnt helped. It happens in Left 4 Dead and Day of Defeat which are both Source engine games. Its definetly not a bug in the game.Any other suggestions please? ;  It's probably defective.  RMA it if you can.  My Radeon 9800 Pro that did this died completely a few months after it started displaying bizarre artifacts like that.   ;  I remember having those kinds of artifacts back in about the direct X 7 days!I fixed it by uninstalling and reinstalling drivers.   