It shouldn't harm the Xbox in any way. I accidentally turned mine off once with my foot and was able to turn it back on without it having any problems.
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That happens every once in a while, you just turn it off and turn it back on.
If it is on while you unplug it all four quadrants of the ring of light turn red. All you need to do is turn it off then when you turn it back on it will be back to normal. Same thing happens when you unplug the AV cord except it flashes.
It happens and the easiest method is to pull out the power cord and then plug it back in. Make sure you want the PS3 to turn off as it will override the PS3 protection from shutting down
Press the PS button in the middle of your PS3 controller, go to "Accessories," then to "Manage Mic." Be sure to register your microphone while you press the power button.
Your router goes on then off, as many times as you turn it, on then off.