If you have issue that my phone won't turn on, try these 3 solution to bring the device back to life.
Part 1. Charge your Android phone for a few minutes
There is no simply way to directly determine what the cause really is. Nor is there an ultimate solution to fix "my phone won't turn on'' issue. When your Android phone refuses to turn on, it is most likely an accessory or hardware issue. So you should first make sure if there is a battery or charger problem.
When your Android phone's batter is running out of power, you' ll get an "Low Power" or "Empty Battery" indicator on the screen when you attempt to turn it on. If the batter is dead completely, you have no chance to turn on the Android phone. To fix the issue, just plug your Android phone into a wall charger to charge it. You should not turn on your Android phone immediately when charge the device, getting it charged for a few minutes. Then come back and try to turn on your Android phone with pressing the Power button. If it doesn't work at all, try charging the Androidd phone with a different cable and charger. The charger or cable you used might be broken.
Part 2. Check the battery and turn on your phone
Pull out Android Battery to Fix My Phone that Won't Turn On
Like other operating systems, Android OS can also be get a hard-freeze and refuse to turn on sometimes. If Android gets completely frozen, it is difficult for you to turn on Android phone as the operating system seems dead and not responding regardless of which button you press. Try pulling out the battery and then reboot the Android phone. On a phone with a removable battery, you can directly pull out the battery, wait about 10-15 seconds, and then plug in the battery back in and reboot the phone.
For those phone whose batteries cannot be removed, you'll have to long-press the Power button. Press your device's Power button and hold it down for 10 seconds. The time may be longer.
Part 3. Perform a hard reset to turn on your phone
"My phone won't turn on and it's full charged. I try a new battery in my phone and it still doesn't work. It has never touched water and has no cracks at all. Is there any way to bring my phone back to normal?"
After all the attempts above, if your phone still won't turn on, you can perform a hard reset on your phone to factory settings. To do so, you can follow the next steps.
Step 1 Make sure your phone is off and disconnected with the charger.
Step 2 Press and hold Volume Down , Home and Power buttons at the same time until you see the menu of recovery mode.
Step 3 Choose wipe data/factory reset. You can use Volume button to scroll and confirm your operations.
Wipe Data/Factory Reset
Step 4 Select Yes - delete all user data option.
Yes - delete all user data
Step 5 Press Power button to enter Reboot system now.
It will take you a few minutes to finish the whole process. After that, your phone has a big chance to back to normal.
There are also other shortcut key combinations for you to do the hard reset. You can choose the right one according to your device model.
► Hold Volume Up + Volume Down + Power.
► Hold Volume Up + Home + Power.
► Hold Home + Power.
► Hold Volume Up + Camera.
This may help you,