Macbook air will not boot 10.5.7 after screen replacement

Hello
Following screen replacement on original macbook air I can only take system to 10.5.6. Will not update to 10.5.7 or 10.6.
Any suggestions?
GeorgeV

BTW, I see the threads on the Thunderbolt update kernel panics. I was kind of hoping Apple resolved the problem since I thought they had pulled the update. Anyway, I do not *think* I am getting a Kernel panic as the boot does not even get as far as the Apple logo. It just sits on the gray screen and does nothing.

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Macbook air will not boot 10.5.7 after screen replacement

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