There are many occasions where you may want to reinstall a package that already exist on the system, such as when a configuration file relating to the package is missing. Yum allows the package to be reinstalled easily the reinstall option.
Within a terminal you will need to type the following:
yum reinstall [package name]
* [package name] should be replaced with package you wish to reinstall such as apache for example:
yum reinstall ea-apache24
Once the package is reinstalled it will re-create the configuration files that are related. This can often times resolve an issue relating specifically to an issue with a package that is not conflict related. More on YUM can be found at the following red hat documentation page: