Artifacts on screen, not sure if LVDS cable loose or GPU issue

https://vimeo.com/452788092

(see the video) I am getting screen artifacts after boot chime, not sure if the LVDS cable is loose from behind the display (on board is fine) OR GPU issue (Redeongate).

I see similar artifacts on an external monitor, I immediately closed lid after pressing power button (see image below).

https://imgur.com/a/a5rH1AL

Can this be a RAM issue ? as I had to reseat RAM couple of times, as I was getting continuous chimes on boot.

I finally resolved it. I booted into system rescue CD and then SSH’ed into the MacBook. Then I followed the guide here

I followed the last steps (for archlinux (system rescue CD  ver 6 & greater is based on archlinux)

Then followed the steps to disable csrutil > Nvram change > remove kext. well instructed in this post

I noticed that the left Shift key, 7, 8 & 9 keys aren't working, Any ideas why that would be ?