My BBGreen got fried (when I power it up it just dims once the power led 
and that's all it does). 


  an someone explain me what I did wrong so it won't happen to me or others 
again? 


Explanation of what I did: The BBG died after several days working 24/7, 
powered up from a power supply 5V 2A, with an 3G usb dongle connected on 
it, and (maybe that's my fault ...) I connected the Tx output of another 
microcontroller to one Rx input of the BBG but also to one Rx input of a 
BBB (I had both the BBG and the BBB receiving the same Tx signal from a 
third micro)
The same power supply was powering both systems (BBG and BBB) and I also 
interconnected GNDs. The third micro sending the Tx signal was powered from 
the BBB. BBB is working well so far. 


Cheers. 

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