The best way to find out if the issue is caused by the monitor or something within the system would be to try a test using another monitor. If graphics are normal with a different monitor, change the monitor if the effects are the same, with another monitor, then it is system related. It could, if you are lucky, just be the hook up so first thing to do would be to check your cable connection(s).
I have a AOC , 19", LED monitor for my P4, PC running on Windows XP. some times, the letters in the display trembles while browsing. It is mostly discernable when the display has a white background. What may cause this defect and how to eliminate this?