Test with Jack DC-IN connector. (With a 2.4A power supply 5V)
The HDMI port work better and the M3 start properly, even with a converter HDMI / VGA.
If the M3 is operating, it is possible to connect a HDD USB 2.5 or USB HUB .... OK in this situation!
But as always, it is not enough, because if I start t M3 and I plug non-powered elements on other ports, the same BIG BAZAR! Example with a simple USB HUB ... The M3 does not start!
I throw in the towel (je jette l'éponge ! en Français) and go to something else, for example with a development platform that works, it will change me!
I hope one day I can test a Banana Pi more stable and more successful!