I have nearly similar symptoms to this problem description, no video, created multiple new SDcards without any difference.
Used partition tool to confirm that SDcards were burned and partitioned properly.
I have surface scanned the SDcards, there are no marginal, or bad sectors.
Unlike the prior user, I have only one Nano unit to test upon.
I can tell the unit is acting differently than before because Force-Recovery/J40 used to keep power-led off until jump removed – this is no longer the case, unit always powers with LED on regardless of Force-Recovery – suspect it is in permanent stuck recovery state.
I am able to use SDKmanager to communicate to Nano, but download of Jetson OS, stalls at 96.4% and then crawls to 99.9% without ever completing. i’m going to let it keep running. SDKManager terminal window slowly updates with repeating message [ 42.8633 ] and tiny incrementing % – it says it is writing the system.img.
I intend to let it run for along time with the hope it will make it further – is there anything else that can be tried to kickstart the unit? (only 1 week old).