I have the same problem some times. If you have an external sd card plugged into the phone, sometimes when the phone is initializing it times out trying to read the card. If you remove the external sd card during boot up and then push it back in once it boots, you will most likely successfully boot all the way up.
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When starting up, it goes to the T Mobile screen then to the Window screen and back to the T Mobile screen and back to the Window screen repeatly.
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