asalam alikam experts sir me ne apna computer per windows 7 ki ha lakin abi un k front sonud pannels kam kar rahe ha lakin back pannels kam nahi karta jab window start hoti ha to back ports k sat speakers lagana se sirf windows start hona ki awaz ati ha koi video ya audio jab play karta hu to awaz nhi ati plz experts solve my problem jab windows xp thi tab ye kam karta ta thanxxxx