no video, no red lights; broken?

[Adobo]

morpheusx said:

try hooking it up with the standard video cable or the component cable and see if it now works.  It is quite possible that you or someone else accidentally changed your display settings on the xbox 360.

You can also try to reset it to the default setting. To do this, 

To reset the display settings of the Xbox 360 console to the default settings, follow these steps:

1. Remove any discs from the disc tray.
2. Turn off the console.
3. Turn on the console.
   
   Note If you are using an Xbox 360 Wireless Controller, turn on the console by using the Xbox Guide button on the controller. Wait for the guide light to indicate that the controller has linked to the console.
   
   Note Make sure that you use the player 1 controller when you do this. The player 1 controller is indicated by the upper-left quadrant light on the console.
4. As the console starts, press and hold the Y button as you pull the right trigger.
   
   Note This action causes the Xbox Dashboard to reset the display settings to the default settings. The console then automatically restarts.

genius^ i had that same prob not so long ago