This is a prime example of a very bad post. It sounds like your English is not so great, so I'll take that into consideration.
We need more information other than 'it's not booting'. Are there error messages displayed? If so, what are they? What kind of hardware are you using? Is this actually Red Hat Enterprise or CentOS or another rebuild? If this is true Red Hat Enterprise then you should have support from Red Hat for installation and such.
Please reply with more information about your issue.