I have enjoyed CoreELEC for a long time on my Odroid C2 connected to a Samsung UE50JU6400 TV.
However after updating to 9.0.2 the HDMI signal was lost after the reboot I could still ssh into the box and yatse reported Kodi was alive.
I then connected the C2 to a iiyama prolite e2483hs monitor. On this monitor I could see the CoreELEC splash screen (on the TV I only got a signal weak or missing message). After the splash screen there is a big white outlined arrow but the screen stays black (no kodi splash screen).
I have re-installed 9.0.2 on the same sd card and on a new sd card. I still only get the CoreELEC splash screen and then just a black screen. With the “coreelec” boot settings set to “debugging progress ssh” I can see no errors.
The dispinfo (when connected to the TV) can be found here: http://ix.io/1KxC
I am using all the default settings including 1080p60
I also tried an sd card with the latest ubuntu for C2 and that boots up fine and shows me the login screen.