ok so im no electronic mastermind and im very new to this whole HD thing. I have a DVD player with HDMI upconversion and i have the HDMI cable etc. I was under the impression that you plug the cable in to both the DVD unit and the TV and bam should be done with... Not so much i plug it in and get no audio or video. Im sure this is simple and im over looking something but I need help...

if it matters i have a phillips dvd player and a sharp hdtv also have the phillips hdmi cable. Any help would be appreciated