Pink screen

The most useful next step is to restart one PC and look at the screen during the manufacturer logo or in the BIOS. If it's already pink there, it's the monitor, cables, or docks, and a factory reset from the monitor's own menu is worth trying. If the logo looks normal and it only turns pink once Windows loads, a driver update pushed to everyone is the likely cause, and rolling back the display driver on one test machine would confirm it.

Did anything get pushed or updated in your environment yesterday or overnight?

This appears to be a behavior from a recent Windows update. While Microsoft hasn't publicly acknowledged it yet, many users already reported this same issue.

Try this workaround

Type "Color Management" in the search on the taskbar to launch this control panel item.

Once it opens, select your monitor > check Use my settings for this device > click Add > select sRGB IEC61966-2.1 if it is listed> set it as the Default Profile.

Restart the computer and see if it helps.