Question Pc booting but no signal and mouse and kb not turning on

Oct 12, 2019
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Hey y’all I just rebuilt my pc with my old parts that I know work together. I originally took it apart to switch out the motherboard but I found out that my I7 7700 is not compatible with the new mobo so I went to my old one. I put it all back together and now when I switch it on the pc turns on but no signal to any monitor/screen at all, and the mouse and keyboard does not turn on.