I'm trying to test an HD210, but can't get the unit to start and display the basic Mountains demo.
I had this unit operating previously, to test it after I purchased it.

Initially I had the Err LED flashing intermittently, so I reformatted the Micro SD card, and reloaded the demo files.
I'm using a microSD in an SD holder. Didn't seem to be a problem before.
The Busy LED flashes intermittently. I've tried the VGA and HDMI outputs. Initially the HDMI output was correct.

Any suggestions??