So I am trying to play multiplayer split screen offline (local play). I have the TV set up with the HDMI cable and everything, and my TV is 1080 and up, so everything resolution wise is supported. Then i open a world and start. But when I go to press start on the other controller, the normal "Press Start" thing doesnt come up, instead nothing comes up. Help?
Is your second controller synced to your Xbox 360? If this controller is not synced the console will not take inputs from it and the "Start" button cannot be used to load a second player into the game.
Refer to this guide on how to Sync your Xbox 360 controller
Alternatively, you may have reached the maximum amount of players on your Minecraft world. On Xbox 360 there is an 8 player limit on a Minecraft multiplayer world. If you attempt to exceed this by adding a 9th player via split-screen you may be prevented from having them join.
If that doesn't work try restarting your game or console.