Check and make sure you have the monitor correctly identified in the hardware list and also that you have the correct colour profile loaded. If the wrong profile is loaded, the monitor colour may have been adjusted to compensate, giving it the pink tinge when windows isn't loaded.
It may one of the guns in the crt is failing. If you have a graphics package or even ms paint produce your self a test card of the primary colours to see if they display correctly. Substituting another moniter would allow you to check the rest of the hardware.