I have a BeagleBone Black rev C with kernel 3.8.13-bone50 and Debian OS version 7.5. The problem that I have is that when I connect the external power supply (5 V) and the board is also connected to USB ( for communication with Cloud 9 IDE) it shuts down after almost 5 seconds.

I searched everywhere on Internet for an answer, but nothing. I also displayed the content of the TPS65217 PMIC but nothing. Nothing that could give me an answer why the board is simply shutting down.

Can someone help me?