HI all I have just purchased and fitted this Card. The problem is everytime I even try to start a game I get some bizare grren lines on my screen and the system Crashes. XFX Radeon HD4850 1GB Gddr3 System: ASUS M3A-H/HDMI- Motherboard 2GB RAM AMD Athlon 64 X2 5200+ 600w PSU (30amps on the +12V) Have installed all the latest drivers etc and no joy. Also tried upping the fan speed and even underclocking the GPU using the Overdrive facility. Have also done a clean install in case it was driver clashes. Any help please would be greatly appreciated.