I have a Pi 3 B, with 7" touchscreen, case and recommended split power cable. I am running the latest Picroft 8.8 which is built on Raspbian Jessie Lite.
After setting up all the above, everything has worked perfectly for 2 days. Today after several hours idle, I went to wake the screen up by simply pressing a key on the physical keyboard, and found that the screen is now black with fixed vertical coloured lines:
Power cycling, rebooting and shutting down have no effect on the screen. The Pi is working fine and responds to ssh / audio commands fine. The screen / pi / ribbon cable had not been touched or moved while the pi was idle.
Any ideas what the solution might be?