If you are thinking of sending your phone for repair, check these easy steps first. They may fix the issue and save your time and effort.
Easy fix 1: Restart your phone
If your phone has a removable battery switch your phone off, take the battery out, put it back in and switch your phone on.
If your battery is not removable, switch the power on and disconnect the charger. Then press and hold the power key and volume down key for about 15 seconds until the phone vibrates and restarts.
Easy fix 2 : Charge your phone
Charge your phone with a USB charger. Make sure you use a compatible USB charger and use a wall outlet to charge your phone.
1. Connect the USB cable to the charger and plug the charger into a wall outlet.
2. Connect the micro-USB end of the cable to your phone.
3. When the battery is full disconnect the charger from the phone then from the wall outlet.
If the battery is completely discharged, it may take several minutes before the charging indicator is shown or before you can make any calls.
Easy fix 3: Restore to factory settings
Reset your phone. This restores the factory settings and erases all your personal content including apps you've purchased and downloaded (you can re-download them afterwards). Back up all your personal content before restoring to factory settings. See instructions in the user manual.
If you can switch your phone on:
1. On the start screen, swipe left and tap Settings > about > reset your phone.
If you cannot switch your phone on:
1. Disconnect your phone from the charger.
2. Press and hold the volume down key and connect the charger. An exlamation mark (!) is shown on the screen.
3. Press the following keys in order: volume up, volume down, power, volume down.
Your phone resets and boots up automatically. This may take several minutes.