Computer has no video / mouse and keyboard have no power

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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homerslmpsonAsked:
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☠ MASQ ☠Connect With a Mentor Commented:
It happens :)

Try swapping the sticks over. It may be that you knocked the catch on the RAM slot when you were changing the graphics card and it simply wasn't seated properly.

At least it looks like the board is OK so either way a good result!
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☠ MASQ ☠Commented:
This model should have a pair of integrated DVI slots on the back (a DVI-I and DVI-D)
Can you try connecting the DVI-I (- the one with the cross with a dot in each corner), and restart with the additional graphics cards removed?
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homerslmpsonAuthor Commented:
The onboard video has covers/plates on them that are screwed on. I'm not home at the moment so I can't check but I'm not so sure there is going to be anything under those plates. I'll check in a bit and let you know.
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☠ MASQ ☠Commented:
I guess it's unlikely - you did say it was a refurb so you may even have a different motherboard. Or it has a Intel Core i5-3xxxP processor so integrated graphics aren't available.

This is how they were meant to be supplied <link>

Take out the graphics card and see if the BIOS complains with a beep or two if you try to restart it - that way we know at least that the BIOS is completing its POST.
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homerslmpsonAuthor Commented:
No dice. Powered the system in with no video card and bit a peep (or beep).
Took off those plates from the back and the 2 DVI connectors are actually there. Tried using the Inge you mentioned but no luck.
The only things connected are the DVD drive and 2 sticks of RAM at this point. The hard drive and video card are disconnected.
I do see the mouse light up for a split second on power up but then it's dead.
PS - it has an i7-3770 CPU.
Not sure how to proceed in all honesty.
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homerslmpsonAuthor Commented:
If I take both sticks of RAM out and try to boot the system I get the beeping and what not.
I put one stick in and it boots...? Are you kidding me? It's a bad stick of RAM?! I've been banging my head against the wall because of a bad stick of RAM?!
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homerslmpsonAuthor Commented:
Yeah I just put the other sick of RAM in and all is well. FML.
I'm grateful and all but come on now. It's quite clear my computer knew I was upgrading her with a new model and was being difficult.
Thanks for the help man! I'm gonna close this and go back to bed lol
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☠ MASQ ☠Commented:
It's quite clear my computer knew I was upgrading her with a new model and was being difficult.

ROFL!

Thanks for the points :)
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