I'm not at all sure where to put this, but here goes. I've got a modest home theatre system with a Toshiba HD DVD player and a Marantz NR1501 receiver, connected via HDMI. After years of no trouble, commercial DVD movies started clicking/chattering randomly several months ago. I thought the DVD player was going bad so I bought a Sony Blu-ray player this week, but when I popped a DVD in the problem was still there and even a lot worse. CD's play fine. I've googled the problem and found a lot of posts about this problem with burned DVD's in computers, but nothing in sound systems. The only other components that could be causing the problem look like the HDMI cable or receiver at this point, but I'm stumped. Is anyone familiar with this problem in theatre sound systems? What's the best course of action? Thanks.