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In my few hours in Tampa this week, I couldn't go through a full regiment of troubleshooting...
but...
It kept saying "Please check the SD card."
Unplug/replug didn't help.
Wifi light will not turn off.
Forward facing light is configured to be off but is now on.
Wifi only connects a portion of the time but playback no longer works.
Made attempts to format the SD card on-device, but it seems this may have failed.
When I get back to Florida this weekend, I'll pull the card and format on a computer... and also look into re-imaging the firmware.