Things You'll Need
Instructions
Verify that the power cord is completely plugged into the console. The power cord connects to the back of the unit.
Plug in a replacement power cord. If the console still does not turn on, there is a problem with the power supply.
Unplug the power cord and the connections to your TV. Using the Torx 20 screwdriver, remove the six screws on the bottom of the console and open it. Look at the power supply (the unit that the power cord plugs into). Make sure there are no loose wires. If you see loose wires, re-solder them. Put the console back together and test it. If the unit still does not turn on, you will need to replace the power supply and/or console.
Locate a replacement power supply. Microsoft does not offer an official replacement, so a third-party power supply is required. There is no universal power supply available for the Xbox. Each power supply varies by manufacturer, so you will need to follow the included instructions for replacing the power supply.