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#1
One one of two displays works -- hardware issue
Got fedup with the daily CHKDSKs on my Win10TP install so I "cleaned" the drive and reinstalled using build 9879. First thing I noticed is that, unlike previously, only one of my two displays worked!
I check the Device Manager and the default Microsoft Basic Display driver was showing, even though I have an AMD R7 240 video card.
I installed the AMD Catalyst drivers and upon reboot, both display worked.
But, I started having CHKDSKs again, so I used a different drive and installed again.
This time, both displays showed upon initial reboot. When I checked Device Manager, instead of the Basic Display driver, it showed Radeon R7 drivers!
The only difference was the choice of which drive to use for installation.
So, I have to presume that filesystem failures on the other drive prevented proper hardware detection and drive installation.
So, if you run into the problem, in a multi display situation, where only one display shows, it could very well be a hardware problem with your drive.