I would like to connect my laptop via HDMI to my receiver / tv?

I have an ATI Radeon 2600 with Windows Vista. My receiver is a harmon / kardon avr 247. I connected everything up, I get audio but no picture

Make sure that the resolution of the video card's native resolution games your TV! In addition, make sure the drivers for your video card are up-to-date! If that fails, try connecting the computer directly to your TV via HDMI is the input (s)!

Hanns·G HG-281DPB Black 28″ 3ms Widescreen LCD HDMI Monitor (v1) [1080P]