Black Screen on Main Monitor

When changing Windows to multimonitor configuration, then sometimes the main display monitor remains detached from the Windows Desktop. Such “Black screen Problems” sometimes happen on all Windows displays. E.g. this also happens sometimes when working with projectors. This situation can usually be solved easily by changing Windows projector settings using “Windows Key + P” (where P stands for projector). Just repeat this key sequence: “Windows Key + P” “Arrow Down” “Enter”.