Hey Guys, I recently bought a Sony component home theatre system for my new iMac. 5.1 surround was working great (albeit after a bit of a work-around) for about a week, until I moved my Mac downstairs. When reconnecting it upstairs in my room, I can't seem to get the Optical cable to show up as Digital audio out in either Sound Preferences or Audio/Midi Setup, they simply appear as "Headphones".... meaning I get no sound at all. I can't work out why this is, I have everything on my amp set up correctly, and I am using the right kind of cable. This is really frustrating because I had the mac set up with all my 5.1 movies and now it is useless. Any ideas? I am using an iMac 2.4Ghz Intel Core 2 Duo, Sony home theatre HT-DDW785, and mini-opt to optical cable (if that helps) Thanks for your time.