After your description, I am starting to think that you power brick is the problem. If it gets to hot or does not function prperly, it Will turn off your xbox. I would start by either replacing it, around $30-$50. or you can try to repair it by following a similar problem [http://www.youtube.com/watch?v=l-8iJapdj9c|right here.] Hope this helps and good luck to you.
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After your description, I am starting to think that your power brick is the problem. If it gets to hot or does not function properly, it Will turn off your xbox. I would start by either replacing it, around $30-$50. or you can try to repair it by following a similar problem [http://www.youtube.com/watch?v=l-8iJapdj9c|right here.] Hope this helps and good luck to you.
After your description, I am starting to think that you power brick is the problem. If it gets to hot or does not function prperly, it Will turn off your xbox. I would start by either replacing it, around $30-$50. or you can try to repair it by following a similar problem [http://www.youtube.com/watch?v=l-8iJapdj9c|right here.] Hope this helps and good luck to you.