I have a compaq presario with an onboard sound card. The mobo has already been replaced once due to a faulty sound card. Last time the sound card just quit working. This time it's doing weird shit. Sometimes it makes a very irritating popping/scratchy noice when I click on links. It either hesitates or skips if I click on a link when I have an mp3 playing. On ICQ it makes odd sounds for no apparent reason. Is the sound card bad, or could something else cause it to be doing this?