HDMI Picture Flash Trouble

[Jackson2939]

I recently purchased an LG 50PG60 and a Samsung BDP 2500. I have Directv HD which looks great on the LG. When I tried to use the Samsung the picture would have a white flash that was brighter at the bottom of the screen and would repeat about every five to ten seconds. It even happened on the menu before the disk would play. I tried switching HDMI cables with my Directv rec. and it did not change. I took it back and bought a Denon DVD 1800-BD and a Denon AVR 2309CI to replace it and my old Harmon Kardon receiver that did not have HDMI. Now my Directv rec. and my Denon blu ray both route through the Denon AVR and to the LG Plasma. When I turn on the Denon Blu ray now, I have a random thin red horizontal bar that flashes at radom spots on the screen and tiny bright dots in random places on the screen. This happens on the boot screen before the movie loads and throughout the movie. My Directv stills looks great though. I even downloaded a trailer in 1080P from Directv on demand to see if it was a 1080p issue with my TV and it looked awesome. I have switched cables, changed settings, tried standard DVDs and nothing helps. Sorry for the long length on this one but I wanted to try to explain the whole scenario. Any help on this would be greatly appreciated! (I have upper end HDMI cables too)