Black screen
Dell Inspiron 7720SE, external monitor is Samsung SyncMaster B2230HD. All working on Windows 8 before applying 8.1 upgrade (64 bit).
Got latest drivers for NVIDIA & Intel graphics as applied by Windows Update after the 8.1 upgrade.
Installed the v7.4 beta but the external monitor is black, but 'alive': I can drag windows off to it but they disappear.
I have attached the diagnostic report.
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