If you had your LCD screen replaced, this is probably your problem. You MUST have your original button. If you have had your phone for less than a year, I would just bring it to Apple. Error 53 is a hardware problem. Check your phone usb and your computer before attempting this. Also, make sure that you have the most recent version of iTunes.
Once they have, you'll be able to view a graph of their reputation gained over time.
Here's a preview of what the graph will look like:
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