Disable system beep for CentOS

Here is way to disable the system beep for CentOS

# unloading the pcspkr module: 
rmmod -v pcspkr

In addition, add the following line in /etc/rc.d/rc.local file to automatic disable it during boot.

/sbin/rmmod pcspkr

if you ever want to re-enable the speaker, run the following command:

/sbin/modprobe pcspkr