Why won't my xbox 360 turn on?

More information is required to provide an accurate answer, however common problems include internal hardware errors (which would require Microsoft repairs), and power supply errors. Power supply errors can be fixed one of two ways.

1. Unplug the power cord from the power brick, and unplug the brick from the console. Leave them unplugged for thirty seconds, and then reconnect them all, making sure they are firmly secured in their sockets.

2. If #1 is unsuccessful, a new power supply should be obtained.