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I have a HTC ONE. While using the phone it got hung. And when i tried to use the power button the Display as well got switched off.

Now When i try to hold the Power button for ten seconds and try to hard restart its of no use. When i connect the phone to a pc via USB i get the device detected sound on windows but HTC One doesnt show its mass storage.

Any way to solve this problem ?

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As per XDA here you can perform force restart by doing this.

To reboot the phone without ADB, just hold down the Vol Up and power button for 9 seconds, the phone should shut down.

If this doesn't power down the phone, you can try this. Lot of people has reported success in this method for most of the HTC phones.

Put your phone under a bright light then hold power+volume down. 

If both of them fails, you have to wait till the battery die and let it charge and power on the phone normally.

Hope this helps you. Good luck.

  • i gave it to the service center waiting for them to get back to me :( – Harsha M V Sep 20 '13 at 6:00
  • Looks like a hardware issue. – k1chy Sep 20 '13 at 6:27
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As odd as it may sound, I found a solution in the net and it worked for me twice already !! Put the phone in a bright light, strong bulb or direct sun, and do a hard reset!!

Worked twice for me.

  • It worked for me too, just using another phone lighter and pointing directly to front camera and sensors. – Ragnar Jan 21 '16 at 17:13
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I've had the same problem with my HTC One M7, but the vol down or vol up with power button didn't force it to reboot.

I was messing around with the phone and a call came in. I was able to answer the call and after the call my phone went back to normal! So I'd suggest trying to call the phone from another phone.

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