No HDMI signal after accidental 12v on j1010 Jetson Nano

I’m very embarrassed to admit that I mistakenly plugged 12v into my brand new j1010 which just arrived with the post today.

I am not getting anything out of the HDMI port after having tried two regular HD monitors and one slightly unusual resolution monitor. Iv’e tried two cables that are both tested with multiple devices. I have no adapters or converters connected on the hdmi cables.

The Heat sink is getting hot though (with correct power source) so it seems like something is happening but I don’t know what.

Is it definitely broken? Or does the board have some protection for too high voltage input?
Is there some way of finding out?

EDIT: I just noticed there’s a very short single green flash on the board close to the data only usb-c.