I have my PC set up without speakers. i have an awesome pair of headphones so i can get loud and not bother neighbors or something. But since the summer started, i have been spending time with the neices and well, instead of Hannah Montana and the Disney factory of bubblegum TV, i try to show them better stuff. like Monty Python, old comedy routines, introduce them to bands that don't have Mouse eared sponsors. anyway, i setup a pair of speakers and now my audio card has vanished. The machine says that no audio device installed. I have a Realtek HD audio card that came with my HP vista setup. have tried going into the bios, deleted and reinstalled the drivers, everything. all this from just plugging in a pair of speakers.