I have a iphone 4s and its stuck at the apple logo to comes up then fades away and every time i try to restoring with iTunes it gives me a 4013 error i changed the charging port/dock and the battery ive also used a different computer and cable

i have a iphone 4s and its stuck at the apple logo to comes up then fades away and every time i try to restoring with iTunes it gives me a 4013 error i changed the charging port/dock and the battery ive also used a different computer and cable

See: http://support.apple.com/kb/TS3694#USB
However, the most likely reason is your self-repair of a device that is only factory repairable broke something. Note that Apple does not sell replacement parts, so whatever parts you used were not made by Apple's supplier and are of questionable quality.

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