My Odroid N2+ runs headless, with nothing plugged into the HDMI. Upon upgrading to HAOS 18, it would not boot (solid red LED, no blinky blue LED). So I took it from its rack and hooked up to a keyboard and monitor, and it boots fine! And runs fine!
So I put it back in its rack, and no boot... without monitor attached.
I have opened an issue on Odroid N2+ will not boot without monitor attached · Issue #4786 · home-assistant/operating-system · GitHub
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