New PSU now no video

I recently had to replace my power supply in my pc. After the pc sat for several months I installed a new power supply as the original one died I now have no video no display at all the fans run the mother board lights up the video card lights up. Yet I have no video the monitor works on another pc the video card works in another pc can you help me fix this problem. I thank you for your time.
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  1. On inspection of the mother board I see nothing to indicate a problem it is a Biostar
    TA 790 GX 128 mb board 4 GB ram AMD duel core ATI graphics
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