Macbook pro 15" boot error and cannot reinstall OS

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to macbook pro got folder icon question mark during boot up. tried reinstalling os , boot dvd drive snow leopard 10.6 pressing control key boot dvd. able click osx dvd icon. thing happen was stuck on grey screen apple symbol.

how reinstall 10.6 os on hard drive?
 

how long did wait on grey screen? booting cd / dvd can take long time.
 


Forums Macs Notebooks MacBook Pro


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