ASUS laptop screen not always stable

Hello everyone.

It's about an ASUS's laptop screen that I would like your assistant on the problem.

I have uploaded a video on the problematic screen. It seems the screen is not always stable.

If the screen has the picture, and not working on the laptop, everything seems fine (not always). But, if with the picture full on the screen, and e.g. I go to start working on the keyboard, or for example I want with the laptop on to go to another place (e.g. from one room to another), or move the screen a little forward or backward for a little degrees, then the image can come to these problems:

-total black screen

-total white screen

-on the left side (about 1/3 of the screen) vertical lines and the rest (2/3 of the screen) white

as you will see on the video:

''https://youtu.be/3Jv71QiDJk4''

If with image on the above problems, I reverse the screen back to about vertical position (or some degrees vertical+/vertical- ), then the image comes back. But, when it comes back, when I try work on keyboard (or not necessary work, if I leave it for some seconds), it may start flicker.

On your opinion, what is the problem?

Thank you for your time.

Finally I purchased a new video cable and made the replacement. Now everything is fine. Image stable, video and sound, everything is working fine.

Thank you for your answer!