I hear the xbox 360 sound but no visual pictures

Is the light on the power supply? if so is it red, green or amber? this can help. If its red it could be either
the power supply which is faulty or a major problem with the 360 which is causing a short or something
similar. What is probably wrong witht he 360 is the 3rrod:

When the Xbox 360 overheats it causes the lead free solder to crack, the more that crack the worse the
machine will get. So eventually I suspect your machine will die completely and show either 3rrod or e74.

To remedy this you need to strip the console down and replace what's called the X-Clamps, at the same
time replace the heat-sink paste and then you need to re-heat the whole board. We use a special IR over
which re-bakes everything and re-seats the solder properly, a lot of people use a heat-gun but you have
to be very careful.

Linda

turn the switch on the video input plug that connects to your system from HDTV to TV or vice versa. On a NON HD tv you also don't have to plug the blue,green,and extra red input plug into the tv, just the red,white,and yellow.