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Rock-4C+ HDMI stopped working


I have the OKdo ROCK 4C+ Starter Kit which has been working fine up to now.

But now the 4K HDMI output has stopped working: I cannot see the desktop - my monitor says, "No signal"

I have tried a different HDMI cable

I have verified that the monitor works with another computer.

The Rock itself is still running:

  • the mouse lights up when moved
  • keyboard 'lock' lights work
  • I can SSH from another computer

I have tried both a restart and a shutdown-powercycle.

I have tried just plugging into the other HDMI socket - still no signal.

Any suggestions? Has it just died?

Are there any diagnostic tests I can run from an SSH session?