troubleshooting Question

Computer has no video / mouse and keyboard have no power

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homerslmpsonFlag for United States of America asked on
DesktopsDisplays / MonitorsHardware
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I have a refurbished HP ENVY h8-1417c. Had it for over a year.
I upgraded the video card a few months ago.
All was well. Now I'm selling the computer to a close friend and bought an upgraded PC. I shut the HP down and put the original video card back in. Now the system gets power but shows nothing in the monitor. I've tried swapping the original video card with the upgraded video card, I've tried multiple video cables (HDMI, DVI, VGA, etc) and they all get no signal. The computer powers in, the fans are on, the video card fans are on, the lights on the system are in but the keyboard and mouse have no power and clearly there is no video. At this point I've tried disconnecting and reconnecting the internal part cable on the motherboard, taking it the CMOS battery and holding the power button for 30 seconds and anything else I can think of.
Can anyone point me in the right direction here?
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