I have a 7in xenarc tsv and it did what you said yesterday..
Here's what happened I was resuming from hibernation after stopping at a grocery store. I touched the screen and there was no response it did the same as you said. I shut it down and the same thing. My front end was mobile impact and i was playing a asf video.
Well My diagnosis was maybe it the video went to the second video card. but it didnt.
Heres how i fixed it. When you restart the pc does the pc bios logo come up.
so there is video during post for like 2 seconds. if there is than your screen is not damaged. I would lose video after loading and resuming .. But here's the kicker. I could here the touch screens beeps when i touched the screen. So that let me know the screen was not damaged.. i got out my usb keyboard and hit ctrl alt del and i got the taskmanger it appears that ffdshow mobile impact and that file i was playing somehow frozen to a black screen. after killing those processes i could see my deasktop..
So thats how i fixed mine . Not sure about yours though..
If you get video during the bios post than it works. Or force it turn on the pc and try and get into your bios.
Now i read you said you adjusted cables something might be loose. I didnt mess with any my wires.
hope this helps otherwise