Hello All,
I have been having some intermittent problems with my computer's graphics. Every now and again (becoming more frequent), the computer screen freezes for a moment, and then overlays purple or green blocks in a diagonal pattern across the screen, or comes up black and reads "No Signal". The cursor and screen then freeze. In each instance, I am unable to log out properly and have to hard boot the machine. The problem often remains following the reboot, unless I wait about 5-10 minutes. The problem is someitmes preceded by colored shadows behind the cursor.
The problem usually occurs during normal use of the computer, such as office applications or running Internet Explorer. I don't run any graphics-intense programs on this machine.
I am using an ATI Radeon 9700 Pro Video Card with the most recent driver installed. I have tried rolling back the drivers several steps, with no luck. My AGP setting is 4x with Fast Writes off. My monitor is brand new, and I have had the same issue with the previous monitor, so I have discarded that as being the problem, and I suspect that my video card may be failing.
Does anyone have any suggestions on how to either remedy or troubleshoot this problem? I don't want to go and replace the video card and find out that the problem is still there (my wife is still a little mad about the new monitor).

Any help or suggestions are greatly appreciated. If you need any further elaboration on the problem, just let me know (its a little difficult to describe).

Thanks!