Boards that was shipped before Dec 22nd 2014 can be affected by this problem. It only happens on some boards.
In some cases boards will not boot properly or have problems with booting in bootloader mode under a USB only supply. In most cases the boards will boot normally with a battery connected, but a few users has been reporting problems with that too.
The cause has been identified to be R26 and the Fix is to remove it. There is no adverse effects to doing this, so it can be done safely on any board.
- R26.jpg (164.85 KiB) Viewed 12029 times
It is not very hard to remove with a soldering iron, using the technique outlined in this video:
Anyone not comfortable with doing this can send a email to Viacopter to arrange sending it back to be fixed under warranty. But pls post problems here, maybe we can find a solution closer to your neighbourhood.