Waivy vertical and horizontal lines on my lcd monitor...

I had a 4 moths old MM17DE-B ASUS LCD monitor at the first look it works fine but lately after 1 month i found a wave like the water blown by the wind with lines...something like that while im playing counterstrike. But I just never mind the maybe it is just when I am playing CS but unfortunately the problem become worst, the thin lines, running upward slanting and so on repeating all over again even in my desktop..so I have replaced my video card into new and it look so fine..I never seen any lines at all.....so I concluded it...that the first videocard I had was some kind of damage.

But, lately this week..the problem occurs again when I am playing counter strike even in version 1.5 and 1.6.
I actually tried a lot of updates of drives, bios, etc..and check all possible reasons...but the problem is intermittent right now...sometimes its there...and sometimes its not.

I am going crazy with this..pls people help ang give me ur best suggestions.