A.o.A
Dosto mery pas hp dc.7900 hai jb new lia to sb kuch thek tha sound fit kam kar rahy thy lekn jb main ny xp sp3 instal keye to us ke audio kam nhi kar rahe boht driver instal keye lekn phr bhe wohe masla a raha hai jb control penal sy spekar wali seting opn karta hn to No device found likha hota hai plz plz koi help kar dy ap ke boht mehrbni ho ge .