HTC One Not turning on

[AC Question]

It's an HTC One M7. I was browsing on it when it decided to start not letting me backspace typing in the browser. This has happened once or twice before and simply restarting my phone fixes it. I did the power button, restart option. Left it do it's thing while I took a shower. Came back 15 minutes later, phone is off. Weird. I try to power it on. Nothing. I tried holding the volume down and power button. Still nothing. Is there anyway I can force it to boot up or any known solutions for this problem? I haven't dropped it or anything lately and it had just been taken off the charger and had like 95% battery. It's really weird.

 

[B. Diddy]

Welcome to Android Central! How long have you tried holding the power button for? Sometimes it works if you hold it down for at least 15 seconds or so.