Black Screen after upgrading to Windows 10 on the remote machines

[Gary D. <ga...@ex...>]

Looking through the archives, I think this may be the same problem as 
reported back in June, 2018 about a headless machine. The monitors are 
normally switched off at night. I can start the computer using wakeonlan 
but I can't remotely switch on the monitor. This makes it impossible for 
me to access the machines remotely using VNC.

In a perverse way, it does make a strange kind of sense - I'm seeing 
exactly what someone looking at the shut-off monitor is seeing.

-------------

I had to "upgrade" a couple of workstations to Windows 10 Pro (from 7 
Pro) to handle new hardware. Unfortunately I can't connect to either of 
them remotely now. All I see at my end no matter what viewer I use is a 
black screen.


Googling suggests this is a common problem with Windows 10 winver 1803 
but I haven't found a solution for TightVNC. They both should be running 
2.8.11 but I can't confirm this.