this happened when i set up the monitor on a different computer on which the screen had worked fine before.
Move it back to the other PC and see if the pink goes away. If it works on the other PC, the culprit on the 2nd PC is either the video card driver, video card, or the cabling.
Adjust the Contrast or Brightness to find if any change . It may caused by PC setting, but if monitor can adjust ,it is the most convenient way