[Centos] Mysql B0rked - new install - confused

Hi Folks,

I've just done my first two Centos installs, having moved over from
WB..er..never mind.

I seem to be stuck with mysql - it's not installing; well, on one system it
starts but there's no /var/lib/mysql folder or socket file and on the other,
mysql just doesn't seem to be there at all.

I have done a 'yum remove mysql' and then a 'yum install mysql' on the first
system and it's not helped! 

Can anyone point me in the right direction to put this right.

Thanks.

NK