htc one failed to start up again after system update

A

AC Question

hey everyone,
so I installed the new system update for my htc one. And ever since then it has not been starting up again it will not start up or just start up to a point and then go *gray*. I have tried charging of course and have pressed the power and volume button until I got the Hboot menu but nothing there works. Neither does plugging it into the computer. I am very frustrated right now, anyone have any Ideas as to what I could do to make my phone work again?
Thank you!
 

B. Diddy

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Welcome to Android Central! Which HTC One do you have--the 1st gen M7 or the 2nd gen M8? Did you install the update over the air, or did you try to sideload it?