After installing graphic card computer turns On for a split second and turns off and repeats this process

May 2, 2018
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I have a HP pavilion 500 PC
Model #500-336 I just installed my 4gb Gt 730 graphic card and now my pc won't start up. It turns on for a split second and turns off and repeats this process. I put my old graphic card in and it is still doing the same thing Please help!!!