I am having the same issues.
I have 10 NUC I5 which are always running and when switching the screens on (Samsung PE46C) I sometimes get a blank screen.
The NUC is connected via HDMI.
Jjonny2 you mentioned the Audio driver. So is there a chance do deinstall it? Because I do definitely not need any sound.
So no fix ever for this? and its a widespread problem?
I think it was working better when I was running hackintosh on it..
pretty much a brick for me .. just cannot switch between normal TV and NUC.. i end up doing remote connection from laptop right infront of it.. and then switch and then sometimes it works