MacBook Pro screen goes grey when attempting reinstall.

I have an i7 MacBook Pro. When trying to reinstall osx 10.6 from scratch, whether I attempt to start from within osx or by booting straight to dvd - the screen turns grey with the dark grey logo.

What could cause this ? What does it mean ? How do I work passed it ?
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ImaginxAsked:
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strungCommented:
Are you trying to re-install using the original disk that came with the system? You cannot use a disk that came with a different model Mac.
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Adam (CodeTwo Software)IT AnimalCommented:
Try disconnecting all external devices, usb flash memories etc. Turn off airport or disconnect ethernet cable. Then try again.
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ImaginxAuthor Commented:
I was using the wrong disc. I have more than one MBP, thought I had to correct version the whole time. Stupid Mistake.
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