Question: My issue here is a very weird one. I just had a power-surge in my room and then my windows display went black and white. The display is B&W but screenshots that I take in windows aren't B&W, as is evident when I transfer them to my phone to look at them. The boot screen is in its normal blue and when I boot Linux, colors work perfectly. Any ideas?

Windows 10, deleted my entire `Users/$MyName$/AppData/Local/Temp` folder before the surge. The delete was done by then and colors were still working.

Answer: 
Actually you have pressed Window + Ctrl + C button by mistake. This shortcut toggles the default color filter.Currently your default color filter is GrayScale and by default filter set to Off.

There are two solution to the problem :

1. Press again Win + Ctrl + C to toggle off the filter

Or

2.

Open Settings.
Click on Ease of Access.
Click on Color & high contrast.
Under "Color filters," turn Off the Apply color filter toggle switch.
I don't really understand why this actually happened, but When I changed the saturation using my `CS:GO Saturation toggler`, I got my color back, and it stayed across restarts. [Link in case you need it](https://www.reddit.com/r/GlobalOffensive/comments/28i4vk/saturation_toggler_v12/)