irritation

Hi guys!! Finally I was able to change my config.. but with old processor (P4 2.4GHz) The gfx card which I got is : nVidia GeForce FX 5200 by Zebronic (256MB) Mobo: GIGABYTE 82845GE RZ Now the prob is: I have an LG monitor in which some kind of waves are appearing (sometimes).This is...