Hi, I did a search, but couldn't seem to find a problem like this, so started a new thread. If it's covered elsewhere, then my apologies, and I would appreciate someone pointing me in the right direction. I've had my system for ages, and the graphics card has always worked a treat, but recently I've been getting strange screen corruption. The corruption is unpredictable, but generally starts about half an hour after the system is turned on. Sometimes it gets gradually worse until the system is completely unusable. At first the corruption can be dealt with by refreshing the screen, but at times it gets so bad that you just can't see what's happening and a refresh makes little difference. A reboot makes little difference, the corruption will return shortly after a restart. The screen can start showing corruption as soon as the Windows logo shows during reboot, but never while the BIOS is used. The problem started just after I downloaded and installed the Stardock utility and used it to install Galactic Civilizations II. As you might expect, the first thing I tried was to uninstall Stardock and GalCivII, but the problem persisted. I don't know if the timing was coincidence, but certainly I never had these graphical problems before. All programs work fine, but all are affected by the corruption. The corruption usually takes the form of patches of green or magenta colour appearing suddenly in a random area of the screen. Picture below, hope the link works OK. This is a pretty good example of how bad things can get, though it has been worse at times. System As on my user profile, running Win XP Professional. If there's anything else that might be useful then just ask. The graphics card is a Radeon 9000 Excalibur with 64MB in a 4X AGP slot. The system runs at a good temperature, well within safety limits, though like most AMDs of this age it's fairly hot. I'm not overclocking anything. Things I've tried: Update of Catalyst version to 6.11 (I think, though the control centre reports version 1.2.2314.20337). Update of Direct X to 9.0C. Update of Sound card drivers. New installation of Windows on different hard drive with all recent drivers. Tested on a different monitor. Tried running with no hardware acceleration. Tried a full spyware sweep with Spybot, and anti virus and rootkit sweep with AVG (all with latest definitions). Tried various modes and resolutions with the monitor, no effect. Tried a thorough dusting of the cards and fans in my system. Tried reseating the RAM and the Graphics card. Tried taking the processor down to 1.3 rather than 1.766 Ghtz. Probably a few more things I don't remember right now... I'm really stuck with this, I don't have a clue what's causing it, I don't even know if it's actually the graphics card that's the problem. I do know that it's driving me mad, even as I write this. I hope that someone might be able to help out, and any and all help would, of course, be appreciated. Thanks.