1) Did you check your sound card?
2)Is it onboard sound?
3)Do you have a announcer? Try turning that off and then play.
I had that problem on my old 800 mhz computer. I couldnt have the announcer or else I couldnt hear any music. Thats my advice man, good luck.
_________________
Where there is impossibility there is possibility, and where there is possibility there is impossibility; It is because there is a right that there is a wrong, It is because there is a wrong that there is a right.