it is clearly stated that the 5100b can require up to 2A for various functions to work. so an external power supply is required. Several places online say to run 5V @2amp power supply INTO the 5v pin.
I'm a noob and have always used the 5v as a power source(OUT) for various sensors etc.
Can you run 5v INTO the 5v pin and use it for external power for the board? I just want to be sure before I let out all the magic pixie dust on my board!