I had a similar issue with my Blackberry 8100. It went into an endless reset loop and the only way I could stop it would be to just remove the battery. Luckily, I was able to take mine into AT&T and they provided a replacement unit for me. Didn't realize it was a common problem as the people at the store were no help for me...
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"Once you go BLACK (berry) you'll never go back" 
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