I had an HDMI problem, and eventually returned the board which was replaced, thank you. However, after 3 days this replacement board is exhibiting similar symptoms, ie no HDMI output, when I looked at it in the morning (I tend to leave my boards turned on all the time). I've tried it with another HDMI cable and monitor, and with 18.04 burned onto an SD Card but with the same result. The board appears to boot, flashing blue lights, but no HDMI output.
The Putty Output is shown here when running
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I have used the identical set up (cable, Monitor, keyboard etc) with an XU4, ASUS Tinker Board, and a few Rasp Pis, and now it is working fine with a Rock 64 so I don't think it is my monitor setup, unless there is something that the N2 does not get on with. I am at a loss what else to do as this is my second N2 to fail.