I currently own a XBOX 360 w/ HD-DVD, and a PS3, XBOX is hooked up to an Onkyo Reciever via monster component cables, then to Philips 50" plasma T.V via component, PS3 is hooked up via HDMI cable. I've had the XBOX since November, and a few weeks ago, I noticed that there are several (20-30) faint white horizontal lines throughout the picture, this is prominent in all screens (HD movie, DVD movie, Gaming, and dashboard), and the "lines" are "fixed" in that they are in the same spot all of the time. I first thought it was a cable connection problem, so I purchased the Monster component cables, and still have this problem. The lines are "fixed" in the screen, but do kinda flicker, but are in the same spot. My resolution is set to 720p. I don't think it's a cable issue, but what is it? could it be just my lens is dirty and needs to be cleaned, or possible interference? I don't know, it had great picture quality for several months, then just started to do this recently. My warranty is expired. Any help would be appreciated, has anybody else experienced this?