Power via jack?

My Arduino101 works fine when powered via USB but it doesn't seem to take power via power jack or power pins. The ON LED stays off when I give 5V (center positive) on the power jack or attach GND/VIN of the power pins.

Is there something I have to do for this to work? Or some way to verify if the board is broken?

Hi lispler,
the 101 needs at least 7 V on power plug to work correctly (https://www.arduino.cc/en/Main/ArduinoBoard101 - Technical specs section)

Ah, didn't see the different input voltage.

How about powering via JTAG, does the board support that? Some JTAG adapters like the Olimex can provide 5V input via JTAG PIN1 (VCC). I've successfully programmed and worked with the Arduino101 this way. Will it break in the long-term?