PC won't show games

  headdeball 12:30 23 Feb 08
Locked

Hi All
Yesterday, my PC screen went black when I tried to play warrock online.I could hear the game but my screen reports 'no signal'The only way out is to reboot.It also happened with Worms played from my hard drive.I changed the graphics card (Radeon 9600) to an older Radeon 9200 and a different screen but the result was the same.It is fine with ordinary surfing and word etc..I have a K7 Triton 400 GA-7va mobo which ,it says,uses a Via KT400 chipset.Win XP pro and 2gb of ram.If it isn't the graphics card or the screen then,please, what is the problem?

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