I had similar problem with BIOS setup of Zotac CI321 (same category of machines) and I think the problem was not HDMI itself, but HDMI/DVI adapter (and an old monitor with only VGA and DVI inputs). Did you use adapter too?
I had similar problem with BIOS setup of Zotac CI321 (same category of machines) and I think the problem was not HDMI itself, but HDMI/DVI adapter (and an old monitor with only VGA and DVI inputs). Did you use adapter too?