Low charge on battery. If the charge in your battery is too low, it will not power the phone. The first thing to try when you phone won’t turn on, is to charge your battery. Plug the phone into your wall outlet and leave for 10 minutes, then try to turn it on again. If that does not work, leave for another 20 minutes and try to power on.

→Soft Reset. Go to Settings option on your phone. Next, select Backup & Reset. At the bottom, you’ll get Factory data reset option. On next screen, tap on Reset phone and confirm it. So these were the two methods that we could use to reset HTC One A9. Before proceeding any of them, you must know that complete data such as app settings and
If so, take it out, then put it back in and try to turn it on. If that doesn't work, take the battery out and leave it out, but plug a USB cable for power into the phone and try that (possible the battery is effed) If no removable battery, then just plug it into power and see if you can get it to work while plugged in (again, because battery
How to hard reset HTC Desire 530. Begin by switching off your cell phone by holding down the Power key for a short while. Afterwards press and hold the Volume Down + Power button at the sime time for a couple of seconds. Next, press the Volume Down to select option "Factory reset", and press the Power button to confirm.

How I hard reset my 6850 HTC Touch Pro Using the recommended method I was not able to hard reset my phone after installing a custom ROM I maid using PPC Kitchen. But what I tried that did work was, Phone off (not just asleep), holding the volume down button, while holding down the round "enter" button, while holding down the power button, then

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htc one hard reset not working