Give me a tutorial on what I have to do. I have the Blue, Red, and Green wires for HD hooked up correctly in the back of my hdtv flatscreen tv. Do I have to have an hdmi cord? I don't know how to get the splitscreen going.
You're using the Xbox 360 HD component cables, right?
Since you've already inserted the three color cables in your TV, check the other end of the wire. On the side that plugs directly into your Xbox, there should be a switch that chooses between HD and standard definition. Make sure it's on HDTV.
The Xbox will automatically detect that you have an HD connection set up and will automatically be running in HD when you turn it on.
To play splitscreen, enter a game, connect your second controller, sign it in, and press start. You are now playing splitscreen Minecraft.