About 6 months ago I bought a custom made HTPC from eBay. The system was sold as having a working HDMI connection, however this has never worked for me. Up until now this has not been a problem as I have succesfully used one of the 2 x DVI ports to connect to my Samsung TV, and use Optical out to provide sound through my AV Receiver. These DVI ports are provided via the Nvidea Geforce 8600 GTS graphics card. However, I now have a need to use the HDMI output which is present at the back of the Antec case but cannot get it working at all. My motherboard is a Gigabyte S-Series GA-MA78GM-S2H. Ideally I would like to be able to use the motherboard HDMI output in addition to the DVI outputs provided by the graphics card. Thanks in advance for any assistance. J.