42RV535U won't boot. Yellow light blinks 3 times.

The title mostly says it all.  After a power outage ( AC disconnected ), my 42RV535U won't boot.  The yellow light keeps blinking 3 times.
I have tried disconnecting, waiting, then reconnecting the power and have tried different outlets.
Any ideas of what I can do to get it to boot, or to further debug/diagnose the problem?

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