Why is my monitor displaying inverted colors?

Episode 1144 (2:16:28)

Ken from Los Angeles, CA
Video card

Ken has a problem with his monitor. All his icons have turned to negative. He tried to change the cable, and he even tried another monitor. Leo says it may be that his settings were changed. Ken should go into accessibility and see if it's set for high contrast mode. But when he unplugs it and plugs it back in, it goes back to normal. Leo says that's odd. Leo says to update the drivers on the video card. If it rights itself when he tries again, that points to a hardware issue and Ken should try replacing the video card. If the video card is on the motherboard, he'll need to put a third party video card in.