Thanks for the video, pictures, and details.
Unfortunately, I don't know exactly what is wrong, but would suspect a hardware problem with either the LCD itself or the LCD cable if you didn't already come to this conclusion.
If the problem show up often, tap 'F2' when you power on the system to get into the bios to confirm you still see the display problem and eliminate any software related issues although I've already concluded it's a hardware issue.
I would guess it more likely to be an LCD cable issue if the problem comes and goes although the flickering issue may be related to your LCD panel itself.
1. If you can run the system safely while the screen is disassembled, you might try wiggling the LCD cable or pressing on the connections to see if this fixes or causes problems, etc. to try to isolate the problem to the LCD cable. Since you mentioned finding the display cable stuck under the rotating hinge, it's possible it may have been damaged if this isn't where it normally should be.
Otherwise, try moving the screen in different positions to see if it works in some positions and not others.
Lightly press on the back of the screen to see if it makes any difference, but I'm not sure that it will.
2. Not sure if you want to send it to ASUS for out-of-warranty service, but if you don't have a better way to reach them, check this
contact page.
Make sure they try to replace just the LCD cable first to solve the problem if you aren't as worried about the flickering issue which may require a more expensive LCD panel replacement.
3. If there doesn't seem to be an easy way to solve this and you can make your notebook a desktop, turn off your notebook screen and just use an external monitor if necessary.
Well, hope this helps and others can still provide better suggestions.
Good luck!
