Pc Sleep issues

Ive been having an issue since i built my pc, in which when the computer is in sleep mode it will not wake up. The lights in my pc turn on, but the monitor never does.

Now Ive obviously tried turning the monitor on but it says no input detected. Where could this problem be? The video card was my hunch but im not sure what to do about this issue any insight would be great.
Do you have a spare video card to swap out? What OS are you running?
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