named stops to work on 3 servers

[pppplus]

I don't know what happen, but named do not restart on 3 servers.

They have the same configuration, centos 5 - 64 bits

After a lot of try, I have "a" solution. I am not sure all is necessary but...

killall -9 named
yum remove bind
yum -y install bind
yum -y install bind bind-libs bind-utils
wget -O /etc/init.d/named http://www.directadmin.com/named
chmod 755 /etc/init.d/named
cd /var/named
wget http://www.directadmin.com/named.ca
/sbin/service named start

I have to remove bind, because just reinstall it change nothing.
Thanks to all people who write some solution in a lot of posts.