So for giggles, try swapping the SD cards between the two Pis.
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Did that.
RPi v3, does not show anything neither with the SD card having RPiOS.
RPi v2 does not show anything neither with OSMC image. Not even in the monitor. It shows this big rainbow-colored square (tested with two different SD-cards and two PSU).
Oh boy, what a puzzle!
I guess we’ll have to leave it between you and the RPi forums. Feel free to come back if you’re sure the problem is with OSMC.