Hi oldskool,
Apart from Dr. House's suggestion, I don't think there is any way to "fix" the Denon 3310. While HDMI output and input level standards are loosely adhered to, there is a considerable variation from one component to the next.
In your case, I suspect the Playstation 3 simply has a more robust HDMI output signal than the Denon, which is why the long cables worked with the PS3. On that note, the cables ARE very long. An engineer I worked with who was formerly with Axiom noted that once HDMI cables exceed about 30 feet in length, you're going to run into weak signal/intermittent problems. And he sat on the manufacturers' HDMI committee who set standards.
You can buy HDMI boosters but they're expensive.
Regards,
Alan
