I've got a FRDM-K64F that I want to power up using an external power source. I put 5V through V_in (pin 16) and the connected the ground to my voltage regulator. I can see the Ethernet light turn on, indicating there is some power going through, but the main 'on' light isn't on, and nothing happens when I press the 'reset' button.
To double check that is meant to work, I connected it to my PC using the USB, hit 'reset', and it worked fine.
How can I run this with an external power supply?