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My four displays lose signal midway through Windows startup

Question asked by dalewest on May 15, 2017
Latest reply on May 22, 2017 by ray_m

I have four TVs connected via HDMI to a 4-port MST hub that is in turn connected to one of the DisplayPort ports of the Radeon 7700-series card in a Windows 7 Professional PC.  All is well during POST and the 1st part of Windows startup (where it says 'Windows is starting'), but then all four TVs lose signal when Windows changes to the "Please wait" startup screen (presumably when Windows changes resolution).  I've uninstalled and reinstalled the driver, to no avail.

 

If I plug one or two of the TVs directly to two of the DP ports via DP-> HDMI dongle, both TVs work fine.

 

Thoughts?  Suggestions?

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