About This Mac window

osxtips-x-256You can use the About This Mac window to find your computer’s serial number when started up from Mac OS X.
Follow these steps:

  1. Choose About This Mac from the Apple Menu.
  2. Double-click the version text, for example “Version 10.11”.
  3. Your computer’s serial number now appears where the version text had been.
Note: Some earlier Mac OS X-compatible computers do not have their serial numbers stored in a way that allows this feature to work. Lack of this feature on your computer does not indicate any software or hardware failure.