Maybe they’re washed out or inverted?
Here are several things to try.
Power off the monitor, wait 15 seconds, and then power it back on.
If that helps, your monitor may be suffering from overheating.
Restarting is an easy thing to try early in the troubleshooting process.
Plus,restarting seems to fix most computer problems.
Check the cable between the monitor and the computer to double-check thateach endis physically secure.
Completely unplug, and plug back in, each end to be sure.
Older interfaces likeVGAandDVIare often screw-secured, but they come loose sometimes, too.
Using your monitor’s adjustment buttons or onscreen configs, find the preset default level and enable it.
If you’re not sure how to do any of this, reference your monitor’s instruction manual.
Adjust the color quality settingfor thevideo card.
Mixing the primary colors of blue, green, and red equally will produce white.
The most likely answer is that you may have enabled theInvert Colorsoption.
