Microsoft points the problem to the display settings and incompability of the TV/monitor with the Xbox 360 console.
While the reason above might be relevant for those who just bought their Xbox 360 and hooking it up for the first time, it is not true for those who have played on the same screen prior to the loss of video.
Some of the reason that you need to check are as below:
If all the above if not causing the problem, rest assured that the problem might be with Overheating.
It's simple to test. Just hook up your PC to the screen and see if it works. If yes, then it's Overheating, just like the other problems.

To fix Overheating issue, this Repair Guide does an excellent job in showing you step by step on applying thermal compound on your GPU/CPU, as well as modifying your X-clamps to support the heatsink better.
When the heatsink does a proper job in conducting heat from your GPU, then you won't be having the Xbox 360 No Video problem.
Rest assured that hardcore gamers and pro Xbox 360 techies recommend fixing the Overheating issue that will directly solve all the other problems.
Basically, it means that you have absolutely no video output on your TV/monitor where your Xbox 360 is connected to.
Sometimes there might be sound, but no picture.
You should watch out for the symptoms prior to this problem, which could be loss of colour, or even uneven distribution of colour on the screen.

The problems that your Xbox 360 might have are endless. And let me tell you what's the main underlying cause of all this. Overheating! If you fix the overheating issue, you fix many errors/problems.
No Video on your Xbox 360 is just another problem that Xbox 360 gamers might encounter.
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