FC17 don't start (time out error)

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http://forums.fedoraforum.org – Hello. First sorry for my low level english. Sometimes , since kernel 3.5, my vaio S13C5E on fc17 is unbootable. I need to reset to retry that it works. I would have liked to post the / var / log / boot file but unfortunately it does not show errors on startup. The file is only written when fedora start to happen. Thanks for your help pics here : http://uprapide.com/images/invite/b3...17e70427dc.jpg (HowTos)