No spectra is being displayed - 6520B QTOF

Hi everyone, 
i am trying to reinstall an old 6520B QTOF, which been down for 2 years.
Vacuum and HV Condition passed.
The status of the Instrument is on "green".
Only the Readback values of Vapor/SG Temp (1024/1024) und für # Points (199648/199648) appear red.
Via the qtofdiagViewerGL I can clearly see the spectra for my compound.
But no spectra are being displayed within MS Spectra Section of the Tune Mode in MassHunterSoftware B.04.00.
I would appreciate any support.
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