It means that the TPS65217C has encountered an issue and is shutting down.
Sounds like you popped the processor and it needs to be replaced.

http://www.elinux.org/Beagleboard:BeagleBoneBlack#Expansion_Header_Usage

http://www.elinux.org/Beagleboard:BeagleBoneBlack#Improper_Power_Down....All_Revisions


Best option is and RMA.

http://www.elinux.org/Beagleboard:BeagleBoneBlack#RMA_Support

Gerald


On Wed, Jul 23, 2014 at 9:24 AM, Vicki Bourget <bour0...@d.umn.edu> wrote:

> I'm currently supplying 5 volts to P9_5 and 6, and the power LED flashes
> continuously. I read in the manual that if it flashes once, the TPS65217C
> encountered am issue and shut down.
>
> Does anyone know what the flashing LED means then?
>
> Thanks!
>
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