my Htc contentiously re-boot (Keep open and closed) .
not have backup files of my wallet or private key .
how can save my bitcoin
* Sorry for my bad languages
What did you do to cause your phone in that way? there might be a solution from what you have done. You have to find more ways to fix your phone because it is the only solution left if your private key is also stored in you phone. And I think the power button is not your problem, but rather you suddenly changed some programs of you phone if you doing some tweaks on it. And if that is what you have done I'm afraid to say your problem is really tough! But if not, don't worry you still can recover things from it.
If only you have installed custom recovery on you phone, maybe it is fixed right now.