Just a warning of a little gotcha here.

I had a very strange situation yesterday where two different Raspberry
Pis--not just different units, but different versions--suddenly refused
to boot any of several OSes at all.  They were connected to an Onkyo
receiver via HDMI which was then passed through to a TV.  I swapped
MicroSD cards, power supplies and HDMI cables.  I made sure nothing that
didn't have to be connected was connected, but I consistently got
nothing but the rainbow splash screen and the upper-right red square
indicating overheating.  It made no sense whatsoever, but I messed
around with them for hours.

In desperation I finally took one of them into another room and
connected it to a different system.  Immediate success!

The fix turned out to be: Unplug the power from the Onkyo receiver for a
few seconds, then plug it back in.

While I'd never seen this particular problem before, I've had other
issues with Onkyo's HDMI implementation that have been fixed with the
same power cycle method.


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