I had to replace the hard drive on a H.P. computer that is two years old. For some reason there is no sound since the hard drive was installed. I tried some of the reasons given by H.P. and Microsoft but yet to find out why there is no sound. Everything I have check states that the device is working. Has anyone else ran into this problem and if so what did you do to get the sound working. There is no sound what so every, even the computer sounds are not working.