Disable/Enable video card

I disabled the video card on my laptop, I had an issue connecting my laptop to a smart TV with an HDMI cable (it was not working). I read on the forum that I could disable the video card on my laptop while plugged in in the TV, then enable it again (doing so solved the problem for some people), so I did that but the screen on my laptop turned black and now I can't do anything on it!

How to enable my video card again on a dark screen laptop?
Thanks for any help!
 
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