In touch screen mobiles it can be software problem also if touch is not working well.To solve these problems try the following steps.
Charge mobile phone battery, Make backup of your impotent contacts data and media files if possible and in most cases take out SIM and SD card.
After reset of Nokia Lumia 920 you will lose all the data and it will be impossible to get it back.so online backup is always important. Try to save all your data, backup on external device or hard drive.
So lets start the Nokia Lumia 920 Restore Factory, Nokia Lumia 920 Hard Reset.
Turn Off the mobile phone for few mints.
Make it Power On
Turn off your Nokia Lumia 920. Press and hold the following buttons Camera + Volume down + Power until your phone vibrates, then release only the Power key and keep pressing the Camera + Volume down for a couple of seconds 4-5s.
On the Start screen,
Tap Settings > about phone.
Tap reset your phone, and then tap yes.
The factory setting for the lock code is 12345
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