Os x lion not booting in the startup....

I can boot os x lion from usb Flash Drive & i create that into dmg file
but when i burn that dmg file into dvd its not booting properly.after the
computer start before the gray screen come i click the alt button & when i
click in the dvd it just showing me apple logo with loading and nothing happened.
..but from the desktop its working fine.. plz help....
thnx!!!

Did you burn the installESD.dmg to the DVD? Take a look a these instructions. http://reviews.cnet.com/8301-13727_7-20080989-263/how-to-create-an-os-x-lion-ins tallation-disc/

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From my past experience, re-installing the iOS does not change
these minor differences...

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Try this article.
Mac Os X: Gray Screen appears during startup
http://support.apple.com/kb/TS2570

Os x lion not booting in the startup....

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