After installing Windows XP Pro on a relatives PC I have been unable to have any sound. Prior to this sounds were OK. When I go to Sounds and Audio Device Properties in the Control Panel under the Audio Tab the default device shown is Line #0 Modem....there are no other options from the drop down menu. There is no sound card installed on the Motherboard so when sounds were available prior to the XP installation I assume they must have been derived from an onboard system. Any ideas or suggestions as to what is wrong? Any suggestions gratefully received.