I need some help solving an HDMI issue with some equipment that I just purchased.

Short Story: HDMI connection from Marantz 6001 DVD Player to Marantz 8001 receiver. HDMI connection from Marantz 8001 to Pionner 5071 Flat Panel. The Audio and Video shut off after 10-15 seconds. The retail outlet where I bought the equipment indicates that it is a power conditioning issue. I think that it is an HDMI compatibility issue. Any ideas?

Long Story: Cable box via component cables to AV Receiver and then HDMI to the Flat Panel works. DVD Player directly to Flat Panel via HDMI works. I took the DVD player and AV receiver into the store where I bought them and they connected them up with my HDMI cable to another flat panel and it all worked. So the only two items that weren't the same were the AC power and the flat panel. I tried different DVD's I tried a Panamax 5100 power conditioner and neither had any effect. I am stuck and not sure what to try next. I can run component from the DVD to the AV receiver but that is just bypassing the problem.

Thanks