Apple Mac mini (Intel-based; Mid 2007) - Manual (Page 43)

Chapter 3 Problem, Meet Solution 43
Telephone numbers are subject to change, and local and national telephone rates may
apply. A complete list is available on the web:
Locating Your Product Serial Number
Use any of these methods to find your Mac mini serial number:
 Choose Apple () from the menu bar and then choose About This Mac. Click the
version number beneath the words “Mac OS X” to cycle through the Mac OS X
version number, the build version, and the serial number.
 Click the Finder icon and open /Applications/Utilities/System Profiler. Click Hardware
in the Contents pane.
 Look on the bottom of your Mac mini.
www.apple.com/contact/phone_contacts.html