|I doubt if it is anything to do with security. Pinkish hue can be lack of green signal.|
Most likely the connection between the motherboard and screen. Move the lid down slowly to nearly closed and see if anything changes. If so it could be the cable has failed due to hinge use. Sometimes the connectors either end can work loose too.
There are other possibilities such has the display module or the screen itself.
I suspect your error is a completely different fault.
Always pop back and let us know the outcome - thanks