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electrostatic discharge, (like if you scrub your feet in the carpet and touch a ground and create an electrostatic shock) - This can wipe the E-prom out. bent pins can also cause trouble. I doubt if you could troubleshoot things like that if it happened without swapping for a known good one. Also hard to determine if that is the case. There is also a possibility that you may have gotten one that suffered from this issue previous to delivery. the problem with all that is it may affect the recognition of a warrantee on electronic parts. many vendors will have a clause about this, or a return charge.
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