With the ONE, HTC decked it out with all the bells ans whistles, making it one of the best available on the market. The 4.7'' display offers a impressive pixel density, the Snapdragon S600 processor with the software creates a powerful combination and the camera is one of the best android cameras of the moment. I then pressed and held the power button. Almost immediately, the screen came on, as expected. After three seconds, the home and back buttons began to flash on and off. After seven seconds, I got the message that said to keep holding the power button for 3 (then 2, then 1) second (s) to restart. Kamran, the very first thing you want to do, is to remove the battery and no longer try to turn your phone, to charge or to sync it. Disassemble your phone, use the teardown for help with that./. Once you have it totally disassembled, clean all the parts with a high grade isopropyl alcohol. Check this guide for a proper procedure. Turn the phone off, press the Volume down + Power keys, and then press and hold the power button. Keep holding the buttons until you see the spinning dots on the Android screen. Press Volume up + Power again and then release the power button. You should now see the boot screen, and the phone should start up normally. If you have successfully unlocked your HTC One M7 Bootloader, you will see the following text at the top of your Bootloader screen: *** UNLOCKED *** And, if you installed a custom recovery, it will change to the following: *** TAMPERED *** *** To clear the HTC One (M7) cache if it’s running Android KitKat: Turn the phone off. Press and hold the Volume Down key. Press and release the Power key. Keep the Volume Down key pressed until the three Android images appear. Use the Volume Down key to select Recovery. Press the Power button to confirm. Tap the home button. Tap the button in the middle at the bottom of the screen. Scroll up or down to find the cog icon. Tap it. Scroll up or down to the icon with a sheet of paper and the letter "A" inside of it. Tap it. Tap the first option. Select the English language by tapping it. Was this helpful? 1. Doing a Factory Reset using Settings (if phone IS working and you CAN use it) Follow these simple steps to Hard Reset HTC One from Settings. Go to Settings , and locate the option Backup and reset. Now, tap on Factory Data Reset. It will list all the details in very brief. Now, tap on the Reset device to start the Hard Reset on your HTC One. HELP - I have AT+T HTC One - stock; I was happily using it too much let the power run down till it died and after that cannot restart. I can reach the Hard Reset Loader screen. I have already tried factory reset. Options. 1. Restart your phone. 2. Force to stop the camera app, clear cache and data. 3. Uninstall the new app you download recently if you have, because it may affect the camera app. 4. Try a factory reset. fq5V8v0.