beep on usb addition

Hello! Whenever I hot plug a USB device, the system will beep about 30sec. after the device is added. I wouldn't mind so much except for the fact that my keyboard is on a KVM switch and every time I switch back to my linux box, I get this beep. Somewhat annoying. I have checked the support database, but didn't find anything relevant. /var/log/messages doesn't show any errors... -Michael