I had a similar problem- my power LED would just continue blinking when 
connected to a 5V power source. This meant there was something wrong. 
First, I checked if my BBB was still alive. To find that, I connected my 
board to a computer via USB. Surprisingly, this time power LED  turned on 
normally. Then to make sure that everything was properly, I ran some 
program as given in the BB website http://beagleboard.org/getting-started. 
 I was happy to see, the programs on the website worked just fine on my 
board. Thus, I was able to conclude that strangely, my BBB board didn't 
like 5V external power source!

On Friday, November 22, 2013 at 6:41:41 AM UTC-8, Bert Lindner wrote:
>
>
> Just had a 5V powered Beaglebone Black seemingly die on me. First the 
> power led kept blinking, then after removing the (BB Toys CAN) cape the 
> power led would flash just once after applying power. Looking back in 
> previous threads this seemed to mean I killed the board somehow; there was 
> also a GPS module attached to one of the UARTs and a probably power hungry 
> USB wlan stick that I'm trying to get to work, so a power hungry setup.
>
> I was ready to declare it dead, it remained just flashing once after 
> repeatedly unplugging and reattaching the power supply.
>
> However I noticed the single power led flash would also happen if I 
> pressed the power button (leaving the 5V plug in). Doing that repeatedly 
> seems to have revived the board, will see if new problems occur. For now it 
> behaves normally.
>
> Is this expected behaviour?
>
> Best,
>
> -Bert
>
>

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