Could be the video card outputting a signal (refresh rate for example) that the monitor can't handle. Find out the optimum parameters for your monitor, and use those.
amd athlon 64 3800
I dont know why the desktop is flickering when i have 2 software apps,media,and internet running...
I check task manager...PF only 512MB
system cache 450k
this apears to me to be more than enough to run these apps at the same time. but it flickers for like a minute then goes away until I open or switch programs.