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Update 10.9.0 to 10.9.4 full problem
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Hello all ;) 
After update mavericks to 10.9.4 i have a problem.

Boot -> grey screen with apple -> black screen


What can I install update? 


I have lenovo ideapad y550 with chipset PM45, graphic gt130m, Audio ALC272, Intel Core2Duo P8700


Sorry for my english

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