Initially I had windows 7 build 7000 installed on my HP laptop 1624tn (Pavilion dv1000 series). At that time, everything used to work perfectly. But ever since I upgraded to build 7057, there's no sound from my speakers. If I plug in a headphone, I can listen to all the sounds properly, but if I remove it, then there's no sound from speakers. Windows device manager shows all the drivers as up to date.