hi the mac book pro that i bought second hand had xp on it with no boot camp just straight xp and a mac os x install cd bought frm shop and i brang it home and installed leopard and everything apart from the keyboard shortcuts and sound works im not worried bout keyboards as much as my sound issue i cant adjust it its grey and in output part says no output found or somthing like that THERE IS NO RED LIGHT IN HEADPHONES JACK i dnt kno wat to do plzz helppp me ill ad pic of sound prefs