My computer screen is showing negative colors out of random. How do i fix it so it's back to normal?

I didn't click anything. I was surfing web one day, and my monitor just changed colors into negative colors. Everything that's suppose to be black is white and other colors are deformed. Any advice on what to do?

Also, this is a laptop.if that matters.

Answers:
your lcd inverter might be over heating. This is usually a sign on imminent failure.

does this happen if you connect it to an external monitor.
Sounds like some of the internal components of your monitor are going or the connection from the internal video card to the screen. It would be best to have your monitor checked out by a service technician, especially if it's under warranty. If it's out of warranty, it can cost more than what the machine is worth.
degauss it.
Have you recently upgraded your video drivers?

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