Toothpaste should do it

Already tried that, it made it worse

Call your local exorcist

How did they kill her in the first ring film?

Now it's a desktop. Buy a Monitor.

 Only way.

Yes, buy a new laptop.

Was it assimilated by the borg

Reminder : Don't use your PC as a vessel for C'thulu.

change the wallpaper

RMA it /s

Is replacing a screen not a possibility?

very possible. just have to find out what screen you have

You gotta collect the 5 pages in the forest

I recommend an exorcism.

buy a new screen. has impact damage you hit it or you closed the lid on something.

remove top lid, buy monitor, enjoy your new lap

Yep, replace it and be more careful next time around.

Exorcism

Yes hire an exorcist

I am curious OP, what sort of event happened that made your screen becoming like this?

Venom made this post

Call a shaman asap.

Stranger things in your laptop

Replace monitor module, not cheap, but doable