Why want phone come all the way on

Hi,

Try to soft reset the phone :

Turn off the phone, take out the battery, then press and hold the ON button for 10-15 seconds (the longer the better). Reinsert the battery, then press ON button to start it. This is a soft reset, and wipes the temporary memory and empties all remaining power in the circuits. A soft reset does not erase any downloaded apps or user data.

Here is a link to show you how to remove / re-install the battery. (you do not have to remove the SIM card or the SD card)

https://www.youtube.com/watch?v=VFpI1L1e....

If a soft reset doesn't work, you will have to perform a hard reset.

Before you start ensure if you can that the battery in the phone has a reasonable charge.

Do not perform a hard reset with the charger connected to the phone.

Make sure the phone is OFF before you start.

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

Here is a link which shows you what to do. In your case the procedure starts at about 35 seconds into the video clip.

https://www.youtube.com/watch?v=5vPOVKyE... .