im running an 8 month old toshiba with vista and realtek audio with updated drivers. surround sound speakers bought in iraq were used on audio output for about a week... then the speakers started acting funny, like with one speaker and one headphone working when headphones were plugged in. then the internal speakers squealed loudly whenever the computer was powered. had to take the speakers out just to get them to stop, and now audio output does not work at all. computer tests both devices as working properly, and drivers are updated.