My first player was an RCA LDR-600, and it was a decent player, but on certain discs, the picture would have dark, horizontal lines that vibrate, or flicker, creating an almost strobing effect. This was very noticable when viewing films in the dark. At first I just thought it was either my cheap player, or bad discs. So last winter I upgraded to a Pioneer CLD 504, and guess what? Same thing. What really got me pissed off was my purchase of the Jaws CAV boxset. The flickering horizontal lines were on all 4 discs in the set. Last night, in a fit of boredom, I dusted off the RCA and hooked it up. Every disc I put in played flawlessly. Does anyone have any explanations as to why this occurs? Could it be because I have too many cables criss-crossing each other behind my AV components? Has anyone else expirienced this problem?