I bought second 2407 Rev.4 but it came in different box (first one has box from czech republic factory) this one looks liek from mexico. Anyway I checked service menu and both have different settings. Is it normal that each unit has different color offets in service menu or it's based on factory from which it came? I tride to change on both monitors to the same settings but I couldn't change Offset 1 !!! How I can change it?