|It may just require the audio driver to be re-installed. This driver can be downloaded from your PC maker's website. Go to their website which is appropriate for your country or region. You will need to know the computer's model number to get the correct driver.|
However, if the computer has had a third-party sound-card installed by you or a previous owner, which is currently being used instead of the integrated sound adapter, you must download the driver from that card manufacturer's website and not from the PC maker's website. In that case you will need to know the make & model name/number of the third-party sound-card.