![]() ![]() If that is overlooked, some services, such as FaceTime, may not work properly. When logic boards are replaced in a system, the technician is supposed to update its serial number to match that of the Mac's chassis. Other programs that use encryption and similar technologies may also show incorrect behavior if these also rely on the system's serial number. The serial number in OS X can be found here in the System Information tool (click for larger view). Recently a hint was posted on MacWorld that discusses the reliance of Apple's FaceTime technology on the hardware of the system, where people who have had logic boards replaced may not be able to connect because of an incorrect serial number following the repairs. While most of the time applications and services you use in your Mac will be relatively independent from the hardware setup, there are some instances where specific software may matter. ![]() If you have experienced problems with your Mac and have had to take it in for servicing, be sure to check your system's serial number when you get it back, especially if the service required a logic board replacement.
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