Here is a general response i've sent to threads regarding green lines appearing on the screen from 1080p / 1080i sources, which can be applicable to any number of 1080p / 1080i sources. Simple fix that may or may not work with cable brands other than monster cable.

Ok, here's the deal with monster cables. Sometimes i regret paying as much as i do for the cables, but the new line (1000 hd) are future proof by monster with a replacement guarantee, so i bought the 1000 hd cable at 35' to run from my hdmi swtich (i have four sources, a ps3 (1808p), an xbox 360 (1080p), an htpc (1080p), and an hd dvr (1080i)) to my 1080p projector. When i installed the first cable as indicated in the instructions by mc, with the arrow pointing toward the destination (my projector), there were the green lines you spoke about on all three of my 1080p sources. The 1080i picture from my hd dvr looked fine. I called mc and they said it was possibly a defective cable, so they sent me a replacement. I installed the replacement, same way, same thing, green lines on my 1080p sources, perfect picture from my 1080i hd dvr. I had a brain fart and turned the cable around, to where the arrow was pointing toward the source (the hdmi switch), and all four sources had perfect pictures. I called mc support and asked them why that would be, and they said that they've run into instances with some of their cables from a particular production run were shielded backwards, and thus the arrow goes in the wrong direction. Apparently the shielding is directional to help avoid interference. I told the rep that i thought that didn't speak highly of mc's quality control, and he claims it was an isolated instance. You may have also received a cable from a "bad" production run. And since a 1080i signal is less "complicated" and less prone to interference versus a 1080p signal, that explains why your ps3 (1080p) signal had a problem and not your wii (1080i) signal. Hope this helps somebody.