HTC One won't charge or turn on. Orange LED does one long blink followed by a short

A

AC Question

Had phone plugged in and was working fine. An hour later when I went back to it, it won't turn on. Tried plugging it in and the notification LED blinks twice and then nothing. Tried both wall plug as well as computer USB. Tried the power/volume up and down for two minutes and still nothing. What next?
 

B. Diddy

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Welcome to Android Central! What was the battery level the last time you saw it? Try keeping it plugged into a wall outlet for about 12 hours, undisturbed. Then try to power it on again.