
blue light is indicating the NT's board bootup sequence. Once booted up, led should turn red/green depending on whether something is in the breech or not.
if it does not get past the blue led, then the board sounds like it is on its way out (assuming you are 100% sure that it is not a battery related issue).
if it does not get past the blue led, then the board sounds like it is on its way out (assuming you are 100% sure that it is not a battery related issue).