I had to reinstall the OS and Now I have no sound from the speakers and my dvd riv doesn't work like it's supposed to. The drive it self runs because I can hear it and see the light in the drive bay but the computer won't read the disks. Doesnt matter if it's dvd of cd. As for the sound I had sound before. I could access the mixer controls but now noe of that is there. I followe the instruction for trying to reinstall the mixer but that doesn't work either. If any one has any suggestion I'd appreciate it. Thank you.