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Hi! I've upgraded to 10.6.3 follow steps given by LeMaurien, sound works, boot up faster too... But I think this breaks capability to play HD video content I've downloaded from iTunes store... It works fine before the upgrade. Now whenever I try to play HD video in iTunes, I get black screen... No sound... And once it said I am playing the content on a display that is not allowed (or something) asked my to try again on another display. Oh... Playing SD (standard Def) content working fine tho.