Ok,i've got a Dell M991 monitor. Whenever i run Call of duty 4 it flickers like a mutha... In the setup screen and the first minute or so ingame. I suspect it has to be a graphic conflict as the screen is old and my Graphic card is a Gainward ATI radeon HD 4850. I've had conflicts with other games as well. My daughter just bought The Sims 3 and after a while ingame or in the setup screen the frames freezes up the screen,and i have to restart the computer manually. I've tested the ram chips and they check out ok. Like i said...could it be a conflict between the Graphic card and the monitor?