Monitor is flickering...

Hi,

I’ve got a question! I’ve got a GeForce3 Ti500 and an AMD Athlon XP 1900+ CPU…and if I play any opengl game like quake, counterstrike or rtcw my monitor flickers. On my PC are the new nvidia detonator xpdriver installed and I’m running my 19’’ Monitor with 100Hz. So I don’t understand why this is happening! Hope you can help me…thanx Mische (My OS is WinXP)