Why Doesn't The OS See My DVD Drive?

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http://www.linuxquestions.org – I'm not sure if this is a software or hardware issue. I'm currently running CentOS 6.3 x86_64 and I want to completely rebuild this machine to CentOS 5.9 x86_64. That being said, what happens is I insert the CentOS 5.9 DVD and reboot the machine. It reads the DVD going through the normal process and after I hit the Enter key selecting a normal graphical install. At that point it no longer recognizes the DVD drive because it asks me what driver to use. The DVD drive is IDE. The hard drives are SATA II 1.5 TB each setup as software Raid-1. To test the DVD drive I remove the disk and allow the (HowTos)