Hello everyone, I am new to this forum and I just recently purchased a brand new imac (27, I7, 8GB, 2GB ATI). The problem that I am having is this imac doesnt have an optical output so I can not take advantage of my Logitech 5.1 surround sound. I called Apple support but they dont have anything that will help me out. (However the gentlemen did inform me that in a few months imacs will be able to sync with apple TV and therefore the optical on the apple TV can be used)But in the meanwhile, I purchased a DIAMOND XS71U 7.1 Channels 16-bit 48KHz USB Interface Sound Card (http://www.newegg.com/Product/Product.aspx?Item=N82E16829111005 ) however Im having difficulties to get it to work properly. Can anyone please guide me it to what I should do to get a 5.1 optical output???