RHEL 6.0 Installation DVD will not boot

I find this perplexing.. I initially installed RHEL 6.0 workstation from the DVD
Now when I try to boot from it again the DVD drive lights up I can hear the drive spinning, then after a few seconds the light goes out
and the system boots from the harddrive.
I have the DVD as the FIRST Boot Device in my BIOS setup
The media looks good (very very clean no scratches or smudges)
Yet for some strange reason it's not boot from the installation DVD
I would appreciate any and all ideas and suggestions