inverted video
Most newer computers and video cards have a hot key sequence to rotate the video, something like CTRL - ALT - (arrow) (up or down arrow to invert, left or right to rotate).
The exact key sequence can be googled by make of video card or computer. ATI video cards for example would be different from Dell motherboard video.
This function can be disabled in the properties of the video device.
I've had a couple of support calls like this where people were trying to create key macros or shortcuts and end up inverting their video.
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