Hey, basically i just found out that I cannot plug in the surround sound system that i bought (onkyo htx22hdx) to my computer directly through HDMI- it has three HDMI inputs but when it didn't work i double checked the manual (http://www.uk.onkyo.com/downloads/1/1/9/6/2/21930778_265d125c3a.pdf , pg19) that it doesn't support PC video signal. Does anyone know a way around this- or a way that i can force just an audio signal down the HDMI cable? Alternatively, to get 5.1 surround, would using an external sound card (http://goo.gl/BCaqT) using s/pdif on my computer mean i can get true surround sound from my PC?