Check the cable if the switch is on TV or HDTV, depending on your TV that could the problem, also if that is not the problem then it could more serious like the GPU is damage or main board or the CPU. Just comment if does not work for you.
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Your xbox 360 may not actually be on if there's no green light and your controller won't connect. If pressing the power button doesn't turn on the console/green light doesn't come on then your motherboard may be bad.
hi there ur xbox needs xbox support when the green dot is on ur xbox is broken but theres a esey way to fix it all u need to do is keep pushing the on buttion untill something happends mosly i do that and it works its basicly the cpu is like not getting a responce from the power buttion just keep pushing it and it will be fine
If the Xbox 360 power supply light is green, this means the Xbox 360 power supply is ok and it is an issue with the console itself. You will need to contact Xbox 360 customer support to service your console. However, if you have a flashing orange or yellow light, it means that your console is fine but instead there is something wrong with your power supply. It indicates that it's not getting enough power.
If you have no power to the console or the console itself is not powered on then the light will not turn green. In other words...until you can turn the power on to your xbox 360 the light will remain yellow. Check the connection to the back of your 360 it may have wiggled loose somehow. The instant that the power brick senses power making a complete cycle in your 360 your light will turn green. If the 360 fails to turn on when you push the power button or when you push the center button on your wireless controller or when you push the center button on a wired or wireless controller that is connected physically to the 360 then I hope it is still under warranty. If not then you should contact someone about how to repair this issue. It may be that the power button is the only thing broken on this machine.
If the control is blinks in sequence with the four LED light on the XBox 360 but it does not change to only one LED, being the one that corresponds to which player the control is, you need to remove the batteries from the control then disconnect power from your XBox 360. Wait a few minutes before reconnecting power to either then attempt to sync the control again. This resolves most issues.
There should be a sync button right on the top of the back of the Xbox 360 controller. While the system is on. Power on the controller. Hold down the sync button on the controller, and then press and hold the sync button on the Xbox 360 console. Wait for a few seconds until the Xbox 360 controller lights stop blinking. Then test out the controller. Any comments of questions, post them by clicking on the add more details link inside of this question that you've asked.