My MacBook works flawlessly after a logic board replacement two weeks ago (the randow shutdown issue) but it doesn't show the serial number anymore (I noticed it when CoconutBattery said my mac was 24430 months old -that's more than 2035 years!-) I went to the "about my Mac" menu, and it actually doesn't recognize its own serial number. Instead, it shows Serial number : SystemSerialNumb. Is this serious? can it be corrected? I don't want to be refused further care because of this. Thanks in advance for your help.