Manfred, a black MFD indicates the MFD does not have power. The MFD needs the battery, avionics and MFD power switches turned on. After selecting cold & dark, all these switches are disengaged. To restart the MFD, you need battery, avionics and MFD power switched back on (see PDF manual / in flight knee board checklist for switch locations).
BTW: When launching a new flight, systems are initialized to be ready for flight and the MFD will have power.
Henk.
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