Unable to boot on Mac Os X DVD

Hi,
i've bootcamp (lastest version), i use rEFIt to choose from wich partition i'll boot.
My problem is, can't boot on Mac Os X partition anymore.
I got the white screen with the Apple logo, and nothing else..
but i can boot on Windows XP !
I tried to boot on the Mac OS X DVD (for an authorization check-up), but i can't ! The screen stay grey and nothing happens..
What can i do ?
Thanks for your help
( sorry for my poor english )

Consider posting under Boot Camp Public Beta found under the section Windows Compatible Technology, for a quicker response.

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