serious problem with n96 ....plz help me to solve

assalam-u-alaykum.....
Doustoun mera nokia n96 achanak chalthe chalthe uss ki scree aik dum black hogayi aur white colour ki lines uss mai aane lagagyin phir mai ne mobile off karke bhi khola lekin koiee faaida nahi hua aur screen bilkul gaayab hai ..........aur jub call karun uss pe toh switch off ka MESSAGE aaraha hai aakhir yeh kya problem hai samaj nahi aaraha hai mujhe??????????????

Aap mai se koiee dost plz meri madad karega