Monitor HP 2010i sleep problems

My computer worked before we moved it from one side of the room to the other. Power it on and it says no signal and the monitor goes to sleep. Can't get past that. Moving back and it does the same. Can anyone help me? P.s. unplugged.. detached connections..pressed down power button holding 20 seconds several times .

Well just paid $100 to extend my warranty ..couldn't afford it but well worth it...he had me do all of that...power off and on..nothing worked until he said to unplug the power source from the back of the tower..unscrew the tom screw (Phillips and flat combined) that holds the side panel...did that..removed gently the dust..three cards held together with white clips on each end.pop open clips.. remove card one at a time..when removed then placed right back in..press firmdown until clips snap shut on their own. Do that to all three.I have the green board for the background inside..place cover back on..plug in power source and it worked!!!!! Hope this saves someone $100

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