Are the bars that appear on your wii like this?

http://youtube.com/watch?v=xwT5hasrVf4

j03yAsunder

That is almost exactly what is happening to me. Up until now I haven't used my Wii for much other than playing Zelda and noticed it there. I had heard complaints about the graphics for Twilight Princess on Wii with the component cables, and just chalked it up to that. However I started playing Zack and Wiki recently and saw the exact same problem. After trying two televisions and two sets of cables (official Nintendo component and composite cables) the problem persists.

I'm going to call Nintendo to see what can be done about it (the problem has been there for pretty much as long as I've owned it) however I bought mine on launch day, and even with the 90 day extention for registering it I think it is just out of warranty.