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 N8 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 N8 Restore Factory, Nokia N8 Hard Reset.
Turn Off the mobile phone for few mints.
Make it Power On
With the phone turned off, press VOLUME DOWN + CAMERA key + MENU + POWER key. for 1 minute
Main Menu>Settings>Phone>Phone mgmt.>Factory Settings>Delete Data and Restore
Type *#7370# then select YES. Default phone lock code 12345
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