I've Googled and searched SE and found issues *like* this, but mine is a different problem than what I've found. I'm setting up a few Raspberry Pi kiosks to be digital signs. The Pis are running Chromium in kiosk mode and, after a reboot, typically boot to a blank screen. However the Pi itself is accessible via SSH and anything else I care to try. So there seems to be something up with the display that I'm totally missing.

I've made the following changes and tweaks to the Pis:

* LXDE autostart runs a command on login that starts Chromium and points it at the right place. The command is **chromium --noerrdialogs --kiosk SERVERURL**
* I've added a line to /etc/lightdm/lightdm.conf to disable screen blanking. I've tried other methods and this is the only one that works. The line itself goes under [SeatDefaults] and is **xserver-command=X -s 0 dpms**
* I've added a line to /boot/config.txt that rotates the display 270 degrees so the monitors can be vertical rather than horizontal. The line is **display\_rotate=3**

Finally, the Pi is set to login to the GUI on boot. When it works, it's working flawlessly. However the booting to blank screen thing is driving me nuts because I just can't seem to track it down. Any ideas? And thanks so much!