It definitely sounds like you need to replace at least the lock cylinder. See the image for the lock cylinder removal process.
As for the loss of power, I don't see how the lock cylinder problem can have an affect on it. Take it somewhere that will do a full scan for free, after you replace the lock cylinder. We'll go from there.
Image (Click to make bigger)
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Monday, October 10th, 2011 AT 5:35 PM