Graphic card displays everything too red. How to fix settings?

So I was playing Minecraft and had to quit to finish a document. Suddenly, MS word screen became too red and then everything else was red. My desktop, windows, images everything was too red. I switched off the monitor and turned it back on.-then it was normal again for 2 seconds and Now even after a day of not turning on, once the windows boots up, my screen is red. The thing is, it does not display green color, so everything looks too red or too blue( mostly too red).

I thought it was a problem with my monitor (which is an old CRT and please don't joke) but when I click the button on the side of the monitor that you use to change monitor settings like contrast and brightness, THAT MENU had all the colors perfectly. But still the background (windows desktop screen) was red. So it can't be a problem with my monitor, right? It displays all the colors in monitor settings menu, But no green in windows. I don't know, but I guess the monitor does not need the PC's vga card to display the built in monitor settings menu. Thats why it shows all the colors and windows desktop shows no green. A problem with my Graphics card? You know how can I fix it?

ENJAY

Just a guess, but have you 'degaussed' that CRT lately? (It's in the CRT settings itself.)
It can be done without any adverse effect, so try it, although it may be your graphics card.

Also, have you cleaned out the tower lately?
It may be related to overheating.
After proper shut down, unplug the power cord.
Take the side cover off.
Make sure to touch a metal part of the tower frame before getting to far inside with your hands.
Look for large clumps of dust, and blocked air intakes & vents. Fan blades for those need to be real clean also.

CPU & VGA radiator fins get clogged with fine dust, and may need cleaning.
Remove any fan related shrouds the cover the sink/CPU. Don't mess with the sink: just the shrouds.
(Too many variations between makes/models to describe this exactly, so work slow and take pictures as you advance through the operation so you can re-construct after the cleaning.)
Then, drag Q-tips, dipped in alcohol, down the length of the fin slots, until all crud is removed. (Listerine works in a pinch).
Reverse shroud steps to attach that.
Give it about 20 minutes to dry, then reinstall any covers, power cords, etc. And start it up.

Guest