Your TV screen or monitor remains blank or black when you start your Xbox 360 console.
The circle of lights surrounding the console’s power button flashes red.
Typically, this means the audio/video (A/V) cable is not connected correctly or is faulty.
Check the connection for the A/V or HDMI cable on your Xbox console.
Check the connection for the A/V or HDMI cable on your television.
Try plugging your HDMI cable into a different HDMI port on your television.
Reset your display settings. To do this:
Remove any discs from the disc tray.
Turn off the console.
Turn on the console.
Note If you are using an Xbox 360 Wireless Controller, turn on the console by using the Guide button on the controller. Make sure that you use the player 1 controller when you do this. The player 1 controller will have the upper-left light illuminated.
As the console starts, on the controller, press and hold Y while pulling the right trigger. The display settings are reset to the default settings, and then the console automatically restarts.