Now you hear it, now you don't...

Hairy is right, you need to reinstall drivers. To make sure that is the case, go into device manager and you should see an exclamation point under sounds, etc. If you do, you know its your lack of drivers.
 
Not necessarily, drivers can be corrupt and not function but still be installed. The system would still report the device as running stable but its not actually functioning at all. Device manager is only good for seeing if a driver is actaull not there, not if its corrupt or domadged.
 
check to make sure the sound card hasnt come out. oh btw, is it onboard sound is did you buy a sound car to slot in the pci slot. and do you know what sound card you have?
 
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