Xbox 360 error 73
Sometimes the easiest way is the fastest way. The signal reset button (the little one to the left of the power button) is also the unofficial reset button for the Xbox 360. With the Xbox turn off, press this button and keep pressing it while you press the power button. Do not release the reset button until you see the system booting up normally. Of course, if there is a permanent or a more serious damage to the system, it won’t work or the error will be recurrent until it is solved. Resetting just clears the error from memory.
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