Your monitor isn't lying to you — you just plugged it into the wrong port.
If you plan to use HDMI to link your desktop or laptop to a monitor, a good HDMI cable is essential. Digging an old, forgotten HDMI cable out of a drawer isn't a good idea, as you would risk subpar ...
I just ordered a new Asus 24" monitor for home use supposing I could hook it up via DisplayPort to my Radeon 6950. Lo and behold it came with only a VGA and a DVI cable. While very annoying I took it ...