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MBP does not boot

I formatted the HD and then loaded back the OS X 10.6.1 and MBP stays with Apple logo screen with circling slashes. MBP won't boot, what can I do to boot it?

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crwdns2889612:0crwdne2889612:0 0

crwdns2942205:01crwdne2942205:0:

How did you load the 10.6?

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