My monitor diplays lots of blue color

Try another monitor if it works the way it should then it's the other monitor. If the result is the same reboot the computer in safe mode by tapping the f-8 key when you see fhe first splash screen choose safe mode. If it still messed up then you have a graphics problem. Take the computer in and have it tested.
Terry

I painted for many years. And now work with photoshop each day.
The selected grey was probably in the blue family instead of yellow family. Most interior colors look better if they come from the warm yellow family, including greys.
There are greys for every color in the spectrum ... from yellow to red to blue. If you pick a grey with bit of red, it will start to look mauve. Orange and it will look brown. Blues inside the grey will turn purple real quick.
Moreover, all colors and finishes are contextual and pick up surrounding colors. Especially satin-or-shiny finishes, because they pick up local colors that change intended hue. For example blue drapes will turn white room bluish. If the house next door is red, and the light comes in window, it will turn white room into pink. Green leaves, and the light from window turn white room green. So when you pick a grey that has bit of blue, the color can change for many reasons beside light bulb. Each room is totally different.
Most folks pick colors by looking at color chip in the store, instead of painting a section of wall inside home. And most folks do not ask the paint store clerk which tints are in that particular color. Sometimes the black tint will turn some bases into a bluish hue.
Go back to paint store and get another grey color from the yellow spectrum.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

The monitor might be faulty ....do a monitor self test ...disconnect the datat cable from the monitor and turn it on ....there would be a color code , if the color code is ...
RED....GREEN....BLUE which might appear as RGB or the colors itself......then the monitor is ...if the color code is different then the monitor has to be replaced

Check the pins in the end of the monitor cable, look for bent ones. If it's okay re connect to the monitor and try again. Unplug the monitor and wait for a few seconds, plug power back in. Cycle power on the monitor. Then restart your computer. Wiggle the monitor cable on either end and see if the color changes.Good luck

The monitor is entering "standby" mode.
In Windows, click Start.
Click Control Panel.
Click Power Options.
Change the number of minutes before entering Standby Mode.

Try a different "data" cable between the monitor and your computer.

Try connecting your monitor to a different computer, to see if the monitor has the same problem.

Try connecting a different monitor to your computer, to see if your computer's video-card is the source of the problem.

See if the set has some sort of reset button. If none do a hard reset on monitor to hopefully clear the cobwebs in monitor electronics and see what happens.

Make sure it is properly plugged into your computer too. (blue headed cord) should go from the screen to the computer. Make sure the cord is not damaged.

There should be a total of two cords needed (one for power (black) and (one from the computer to screen (usually blue))

Im guessing your using a CRT...? Please add some detail in this stuff, next time. Either magnet problems, or bad monitor.

1) Try moving everything away (Magnitized Problems)
2) Plug in another monitor
3) If it persists, call manufactor
4) Trash it :(

God Bless Bro

go to your desktop and right click anywhere... then go to settings and try changing the screen resolution or the color quality. if this doesn't work, then hit the troubleshoot link and it should come up with a solution