I'm trying to help my brother out with his computer. Recently, he put in a Creative SB Audigy 2 Card in a HP Pavilion m7640n Media Center PC. It worked fine for a few weeks, but then it suddenly stopped working. He switched to the onboard Realtek HD Audio sound card and that worked fine until two days ago. He uninstalled the Audigy 2 drivers after some trouble, then he tried this solution (http://tinyurl.com/2u738g). It seemed to work, but he does not get sound from his computer despite having the volume turned all the way and having the speakers properly connected. We're not sure what the problem is, so any help would be much appreciated.