I am currently running a 2011 macbook pro with 32bit windows 7 installed, and running Snow Leopard. There is no sound comming from either the headphones or the speakers. The headphone jack emitts the red light. I have installe all of the drivers from the mac osx disc, and have tried installing both the cirrus and reltek drivers. None of these soultions have worked. When I opent he device mananger, the sound driver that appears is the Intel(R) Display Audio, and the driver is listed as up to date. I have also updated bootcamp to the latest version. This is truly frustrating, and I would appreciate help. Thank you.