My htc 626 won't cut on!?!

[AC Question]

So I was on my phone texting people but then someone called my house phone and I got up and answered it I came back and it was off. So I cut it back on no matter how long or how many times I tried nothing worked, I have it plugged into the wall and a orange dot flashes by the camera. What's up with my phone?

 

[Ry]

How long did you leave it plugged in?