loud "BEEP" signal during live wheezy startup

["upiter77@lycos.com" <upiter77@lycos.com>]

hi

I've created LIVE wheezy hdd using live-build:[code]
# lb config --mode debian -d wheezy -b hdd -p xfce[/code]
During the startup, I get a quite loud "BEEP" signal.
Howto switch it off?

BTW creating a live squeeze usb-hdd with syslinux didn't produce this BEEP during the startup on the same machine.

greetings
Piotr