How to flip the screen's image on my pc?

Q: When I open my computer, all my desktop icons and menus are upside down and even my mouse works backwards (lower left corner drag brings my cursor top right). For everything to be normal, I would have to rotate my screen. I dont know how this happened, but is their a setting that can help me flip back the image to its orignal form? Thanks for your time!

A: control and alt, and hit the up key

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