My problem is that my monitor says no signal only at two games,but otherwise it works fine.I really don't understand,because I have the game's recommended requirements,but I guess that doesn't affect this.Plus sometimes my comp starts with no signal screen,and sounds like a combine.But it reacts on the alt+f4 enter combination to shut down.The voltage can't be the reason,neither the monitor,maybe the graphics card?But why only at Call of Duty 4 and 6?Configuration:Intel Dual Core 2.7 Ghz,2Gb RAM,Ati Radeon HD 3850 DDR3 512 Mb,OS:Windows 7 Home.Please help!