Disable System Beep

Just add this to /etc/modprobe.d/blacklist

Code:

# turn off the PC speaker
blacklist pcspkr

Or

Add the following to /etc/rc.local:

Code:

for i in 1 2 3 4 5 6
do
       setterm -blength 0 > /dev/tty$i
done

Or

vi /etc/rc.local
add this line to the end of your script
just before the exit 0
restart service or computer.

modprobe -r pcspkr
exit 0

Or

Put this command in /etc/profile:
setterm -bfreq 0