Hello Ian
quick question:
there is a jumper between the power plug and the usb plug (called sv1). Is that jumper connected between pin 1 and 2??
this tells the board where to get the power supply from. between 1 and 2 is the external dc plug while between 2 and 3 is the USB plug.
If your power adapter has a selector for multiple voltages make sure it is set to 9v or more..
let me know
massimo