hi , i was trying to fix one of my friends old computer. On that all of a sudden sound stopped working. sound files seems to be playing ,but no output comes through speakers or headphones. I have done all the basic tests, and evrythng is fine. When i checked in control panel ->sound and audio->voeme tab , device volume ans speaker settings i can't use, it appears like disabled. Pls note the audio drivers(realtek alc650) are properly installed. I have spent more than a day downloading and reinstalling the drivers and googling to find out the issue. But still in vain. Now i want to try reinstalling XP, but my disks r missing , so i need to give a try in this forum. Pls help.