Macbook pro will not boot into Mac OSX

When i got my MacBook Pro it would boot into Mac OSX fine. Now it wont even give me the option and will only let me boot into Windows which i have running through bootcamp. I have tried reinstalling MacOSX but my OSX installion DVD will not get recognised and i cannot boot off it either. I have tried using 2 other discs still with the same issue. The confusing thing is that the CD/DVD drive works fine and the MacOSx discs work fine in other macs as i have tried it in my brothers machine.
Any help appreciated.
Thanks

I don't think that the laptop even has Mac installed anymore becuase in an attempt to reinstall Mac the partition was formatted. And I can't boot of the disc becuase it just ejects by itself after a few seconds in the drive.

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You cannot boot Windows from an external device. The Windows installer and Windows itself must be booted from an internal optical drive.
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http://support.apple.com/kb/ht1509
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There is always the forum for MBP
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Macbook pro will not boot into Mac OSX

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