I have a PC with a Gigabyte GA-P35C-DS3R (rev. 1.x) mobo (GIGABYTE - Product - Motherboard - Overview - GA-P35C-DS3R (rev. 1.x)). It comes with a on board Realtek ALC889A sound chipset. I have installed the latest sound driver from Gigabyte (GIGABYTE - Support - Motherboard - Driver - GA-P35C-DS3R (rev. 1.x)) but I have a weird case... The Windows events sounds are not working... When Vista starts, when I increase the sound using slide sound systray control, when some clip plays on a youTube clip... No sound! But when I use, for example aimp2 music player, or when I do the realtek audio manager sound test... I got the sound!!! I´m not sure, but I think the problem started after the SP1 upgrade. Best regards, Luis Santos