Apple does not document the specific details of how a machine can lose its serial number. Repairing a system by swapping hardware components is one reason this can happen. It is possible for a system to lose its serial number so that it will no longer appear either in System Profiler or the I/O Registry. Other reasons appear to be possible but Apple does not enumerate every cause: Caveats for using the serial number The technical note suggests the serial number can vanish if hardware components are changed. Technical Note 1103 warns developers not to rely on a serial number being available to uniquely identify a Mac. A lack of a visible serial number should not affect your Mac.Īpple does not guarantee a serial number will be set.
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