What are these lines on the screen?

el
5
What are these lines on the screen

The laptop is from my school and I just opened it and then these lines were on it, please for help

li

Probably display or graphics card.

ey

Why should s be the graphics card?

li

Because it got too hot. Especially found on Macs.

Sp

The thing probably doesn't even have a graphics card but only the cheapest apu lol

li

There's still a graphics unit in an APU.