A few days ago, my keyboard keys that are used to control sound volume quit working. I can control the sound through the system preferences "Sound" doo-hickey, or from the upper taskbar on the desktop (I'm using SoundSticks/iSub combo); when I either try to raise or lower the volume from the keyboard, I can hear the "feedback" on the little speakers on my iMac (Summer 2000 edition), but not on the soundsticks, even though, in the sound preference panel, "soundsticks" is selected.