Use this Xbox 360 troubleshooting guide to fix a console that doesn’t turn on.
Information in this article applies to all Xbox 360 models.
There are separate instructions fortroubleshooting an Xbox One that won’t turn on.

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Unplug the Xbox from the wall and plug it back in.
This simple solution can resolve issues with the power supply and the console.
Let the Xbox 360 cool down.

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Disconnect and reconnect all A/V cables from the TV and Xbox 360 console.
Four red rings mean there’s a problem with the connection to the TV.
confirm the audio and video inputs are in the correct ports and check for physical damage to the cables.

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If the issue persists, use a different A/V cable to test your system.
Remove and reinstall the Xbox 360 hard drive.
If all else fails, reinstall thehard driveor replace it.
If you go this route, confirm to transfer your Xbox 360 data to a new hard drive.