Originally Posted by HollowLeon
Thanks for all your replies, the only solution I found is I SMACKED (yeah you just read that right) the phone really hard and the red blinking light came on! Thank God, I thought of buying new ones, turns out didn't have to.
Odd. Now I wouldn't recommend anyone else follow this "fix".
Suffice it to say, don't let your battery level drop until the device shuts off, when at all possible. There are safeguards to prevent it from dropping too low to take a charge, but these are not always failsafe. My thought is something like that happened in your case. Why "smacking" the phone fixed it, I have no idea.
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Phone: AT&T HTC One (M8)
Tablet: Samsung Galaxy Tab Pro 8.4 (WiFi only)