Dell Inspiron 6000 (<3 years old) OS: Win XP Media Center Sound: SigmaTel C-Major Audio Nothing was working, no sound at all... so I went into Dev. Mgr. and disabled and then re-enabled the sound card. This caused the sound to begin working with Media Player, but it will not work with anything else, such as system sounds or YouTube on the web, etc. Things I have tried: I have gone into the Advanced Sound settings to make sure nothing is set to mute. I checked the driver, but it tells me I have the most current driver installed. (Side note: I just had my LCD screen replaced as the old one was going black on me. Once I received the computer back, I also tried to clean it up a bit by uninstalling some unused programs, running the defragmenter, and purging the temporary files. Could this have affected the sound?) Any thoughts about a fix would be greatly appreciated!