Hello, I built a PC for my brother a couple of weeks ago. 550W Seasonic S-12 80 + efficiency 12cm fan, Active PFC ASUS P5B-E iP965 1Gb (2X512Mb) Corsair TwinX XMS2 DDR2 PC5400 (667) 256MB Gainward 7900GS Bliss Golden Sample PCI-E Everything has been ok so far, had a couple of problems running oblivion but I out this down to the nvidia drivers being buggy. Today (christmas day) he got Medieval Total War and about 5 mins into playing it crashed. On reboot the screen is corrupted right from the start and although it will boot into safe mode, it will not boot normally. The screen corruption is present at all times, on boot up it takes the form of weird characters in different colours. In windows (safe mode) there are loads of horizontal dotted lines. My first initial thoughts are that it is the graphics card and I would appreciate it if someone could give their opinions on it?