So, I bought a refurbished Xbox 360 (already a bad idea) and from the first time I began using it, I noticed that certain things would change color while I was playing. The sky would randomly turn green, etc. I assumed it was my cables (which are the 6 HD component ones). Yesterday, the screen started freaking out, and I just decided to turn it off. When I turned it back on, to the same channel it's always on, it now says "mode not supported." I bought new cables, and it's still saying that. I'm assuming this is now a video-chip problem?