Yellow line on top of laptop screen.?

I cognize their is already a couple of question about this but they didnt help.

I have a thin component thick yellow line running down my screen, it appeared after i was playing a computer game on top of art that wherever probably to high.

This has happen to ME before about a year past connected the selfsame laptop after playing a different game with the graphics as well high, merely the line disappeared after 2 days.

The line doesn't change if i put pressure on the screen,
It doesn't appear provided i squander an external monitor.

Any advice would be super.