my nokia n8 has locked ! what should i do?

[KousarSadeghzadeh]

i've bought a nokia n8 last week , last night i was listening music that it locked automaticly as usual but when i wanted to unlock nothing worked ! either the screen,the turn off key or even unlock key what should i do?

 

[colton]

take the battery out and put it back in

 

[GauravSarkar]

remove the battery and restart.