Pink screen

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.

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?

Since it's every machine at once, I'd suspect something pushed to all of them rather than a hardware fault. The quickest check on one PC is Windows color filters, which a stray Win+Ctrl+C shortcut can toggle on, so look under Settings > Accessibility > Color filters and see if one is enabled. Does the pink show up on the login screen too, or only after signing in?

I tried all this and it is still pink

In Windows 11, go to Start > Settings > Accessibility > Screen tint.

You can turn your screen tint off, or change to a different color.