I have also seen this occur on the order of 1/20 boots using 5V power jack. 
I'm guessing it could be due to a 'glitch' in the power supply, or possibly 
to noise entering some of the GPIO pins that effect boot. It looks to me 
that in these cases, the BBB does boot, but just doesn't turn on LED's as 
holding the RESET pin (i.e S3) down for 10s turns BBB off; this indicates 
to me OS is up and timers are working.

On Monday, November 9, 2015 at 10:02:36 AM UTC-5, Fohnbit wrote:
>
> Hello!
>
> Sometimes my BBB Rev C dont boot, when I connect the 5V.
> The Power LED is on but the 4 USR LED are off.
>
> This happen not really often ... So I have no debug information.
>
> But maybe someone has the same problem and know where the problem is?
>
> Thank you!
>

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