I installed SP2 last night and, like Caz, I lost all sound. The sound card shows up and says it's working. I didn't have time to mess with it last night. This morning I discovered that sound is coming out of a headset that is plugged into the soundcard. Perhaps it is behaving the way it should, and the headset is cutting off the speakers which is the way I'd expect it to work but it never did before. I always had sound out both the speakers and the headset. I'll unplug it when I get home and find out.
Jim
Jim