I flashed a 16GB sandisk card using etcher (as the quick start describes). When I boot I see a green flash for 1 sec and then nothing - no green or orange led. The cooling fan is running continuously, so I'm guessing it is not an insufficient power issue. I've verified that the SD card is properly inserted - I hear a distinct click when I push it all the way. Connecting the SD card directly to my PC shows 3 drives as expected.
Any idea what is wrong?