maybe somebody facing the same issue … i m using etcher (and Win32DiskImager) to create ma SD card img, and whatever is the img, my bpiM3 doesn t boot… I change the SD card … still the issue…
i can see the blue BPI welcome screen then reboot… etc
i also have same problem, i use samsung 64GB evo+, 8 GB class 6 memmory card and 5v 2A power mobile adapter , only show bpi welcome screen after few seconds RBG light are off, if i not using hdmi cable RBG light not off.
img are 1. 2017-07-13-ubuntu-16.04-mate-desktop-beta-bpi-m3-ov8865-sd-emmc.img,
2. 2018-01-04-ubuntu-16.04-mate-desktop-v1.0-bpi-m3-sd-emmc.img_2