No boot after GPU replacement

Apr 9, 2018
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I finally got my gtx 1060 in the mail and began replacing my old 660, after replacing it I tried turning on my pc. Once I hit the power button nothing turned on. I thought maybe it was the new gpu and put back my old GPU but it's still doing the same thing. The only thing I see is a green light on the Mobo,and a green light on my old gpu.Any help would be appreciated