My video card is dead on my 360. The tv started going green and now there is no output at all. Tried different av cables, different tvs, different games and no luck. It is not sending a singal. I happen to have a second 360 for parts. Can I take the second 360s graphics card and put it in the other? I have taken the spare 360 a part and can not see any detachable video card like in a PC. Is it built right into the motherboard??