Sounds like the PMIC may have been damaged on the USB power input or the
current the board now consumes exceeds the 500mA budget on the USB. If the
later is the case, then the culprit could also be a damaged pin on the
processor somewhere.

Gerald.

On Wed, Feb 4, 2015 at 12:31 PM, <jordan.bala...@gmail.com> wrote:

> Hi,
>             I've had my beaglebone black working for several months using
> USB power from the computer. Lately I've been using it for a project and
> switched to barrel jack DC power. Now, it only works with barrel jack DC
> power, and if I plug it into a computer, USB battery, or power supply with
> USB, it won't boot. The power LED flashes briefly and then it turns off. No
> combination of power or reset will turn it on. If I have both DC and USB
> plugged in, then it works fine and USB networking works, etc. Has anyone
> seen this? Did I blow a fuse or something?
>             I was planning on using a USB 5V battery for a project. I
> guess as a workaround I can cut the mini USB connector off and plug the
> wires into P9_1 and P9_5, which is the same as DC barrel, correct?
>             Thanks--
>
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-- 
Gerald

ger...@beagleboard.org
http://beagleboard.org/
http://circuitco.com/support/

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