Dell inspiron 3521 abruptly stopped functioning

i also happen to have the same problem with my dell inspiron 3521.i dont know what happened but all i can say is it abruptly stopped functioning.i tried you checking for it in the device manager and it was'nt their.i tried your method of registry and restarted the computer but nothing cd/dvd does'nt light nor opens.i please need some one to help me .i cant live without my laptop