any error messages?
tried plugging in a pair of earphones?
Try adjusting the hardware keys for volume control if there is any, sometimes it is independent from the windows audio.
Start -> Run -> devmgmt.msc (Any yellow exclamation marks or red crosses?)
There were no error messages.
I have, and no sound came out of 'em.
And my hardware keys for sound are hooked into the volume thing on my taskbar.
There we no yellow exclamation marks or red crosses.
@Glarbage : Whenever I try a system restore, I get this error
EDIT : I noticed that my internet icon always shows as "no connection" with the red X since I've had this sound problem. i can get onto the internet just fine though.