I have the same problem. 
I often connect BBB with a PCB as power source and don't have such problem. 
But when I power it with USB of my MAC, it does that some time. (I also 
attach a WiFi USB dongle to the BBB).
 

On Monday, November 9, 2015 at 10:23:14 AM UTC-5, Wulf Man wrote:
>
> As posted here a few times.
> If your power supply does not have a fast enough rise time getting up to 
> voltage
> your BBB will not boot reliable.
> You have not said what specs your power supply is or where you got it 
> from. 
>
>
>
> On 11/9/2015 8:02 AM, 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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