I need help with GPU installation

novice001

Right off the assembly line
I have an old PC which I use primarily for graphic design. I recently changed my old 945GC motherboard due to some technical issues and upgraded to Gigabyte GA-G41M-Combo motherboard. The upgrade has been working perfectly except for one glitch. Whenever I try to insert an NVidia 8400GS GPU and run the setup, the monitor display only shows hazy bands of lines, although the GPU fan runs well enough. The graphics card was working perfectly with my old mobo and I doubt if its gone. The PSU is also good and ran the earlier setup flawlessly. Any suggestions?
 
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