Right I'm trying to get my PC to connect to my HD TV via DVI TO HDMI, this works without any flaws and now i know that DVI doesn't transfer sound over so i've bought an optical audio cable to connect to them both, but I'm not getting any sound, any suggestions?
More aboutoptical audio cable
99% chance the opti jack on the tv is an output only. Go 3.5mm from your sound card to two RCA jacks on the tv. HDMI number 1 should have a pair of RCA's designated for its use.