here are a few steps to try let us know how you get on.
1.Press the Guide button on your Xbox 360 controller to get to Settings, and select System Settings.
2.Go to Console Settings, click Display, and then select Reference Levels, followed by Expanded.
3.Return to Display and click on HDMI Colour Space and then select Source.
1.Follow the first step in Solution 1.
2.In System Settings, select Storage or Memory.
3.Highlight a storage device (any will do) and then press Y on your controller.
4.When asked to Confirm storage device maintenance, just click Yes.