Display problems with ATI 9600

Well I am using asus P5P 800 VM motherboard, 2.53 GHZ intel celeron processor and 1.5 GB ram installed in it.
I have bought an used ATI 9600 AGP card and installed it in my system, it was working good but then I have changed my system's processor and installed an used 3.0 GHZ intel processor.
Now I am having problems with monitors display. Now it is showing yellow lines.
If anyone have the solution please tell me because I am really depressed.
 
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