Assuming everything else was and is working OK that's usually a driver issue but a factory restore should have installed the necessary drivers. You can check in device manager and see if there's some problem showing there with any of the audio releated hardware. If you need the drivers they should be on the support page for your model.
You're welcome. Did any problem show in device manager? If all is OK you may need to make some adjustments to the audio. You'd go to CONTROL PANEL--HARDWARE AND SOUND--AUDIO DEVICES AND SOUND. I'm not running a vista machine so can't guide you much but poke around there and see if anything is disabled or maybe the volume is set too low.
The information on Computing.Net is the opinions of its users. Such
opinions may not be accurate and they are to be used at your own risk.
Computing.Net cannot verify the validity of the statements made on this
site. Computing.Net and Purch hereby disclaim all responsibility
and liability for the content of Computing.Net and its accuracy.