My mi 4 is not turning on...

"Hi,

You need to try to hard reset your phone.

Before you do, try if you can, to charge the phone battery so that it has a reasonable amount of charge.

Do not perform a hard reset with the charger connected.

Warning : A hard reset will erase all your downloaded apps and user data and will restore your phone to factory default condition.

To perform a hard reset :

Turn your phone off.

Press & hold the Volume Up and Power buttons together.

Release the Power button when the Mi logo appears on the screen (don’t release the volume up button yet).

When Recovery mode shows, release the Volume Up button

Navigate using the volume buttons (up or down) and confirm by using the power button.

Select “English” (or whatever language you prefer).

Then select “Wipe Reset”.

Next choose “Wipe all data” and confirm by selecting “Yes”.

Be patient the process takes a few minutes."

I also faced the same problem,but my MI4 phone finally turned on when I pressed the volume button and the power off/on button. I changed my preferred language,then selected first option REBOOT because I fear loosing my installed apps . And BOOM It started working normally!

"Hii @KIRAN PANWAR,

If the phone turns off when the charger is removed it appears as though the battery is failing to hold its’ charge and needs to be replaced.

Here’s a video that shows how to change the battery in the phone.

Replacement batteries are available online. Just search for Xiaomi Redmi Note 4 battery to get results for suppliers of the part."