I'm using my Beaglebone Black to drive a DC motor and read a rotary encoder:

https://github.com/justinpearson/Beaglebone-motor-from-command-line/blob/master/Images/lil-motor-setup.jpg

Last night when I rebooted my BBB, it shut down but didn't reboot: None of 
the 4 blue LEDs lit, although the blue LED by the 5V power plug did light 
up when I plugged it in.

This behavior persisted across several plug/unplug cycles of the 5V power 
adapter. I was afraid I bricked my BBB.

In desperation, I unplugged all the I/O (P8_33,34,35, P9_29,30,31). Then I 
plugged in the 5V power and it booted!

Any idea why that happened, or how I could fix it in the future without 
unplugging all my I/O?

Thanks,
Justin

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