How Do I Check My Apple Computer’s Warranty Status
With your Apple product’s serial number, you can easily check your warranty information online using this link: https://selfsolve.apple.com/GetWarranty.do
To find your Mac’s serial number, use the System Profiler Utility (Application -> Utilities -> System Profiler)
Alternatively, go to “About This Mac” and click twice on the Version Number.
The Serial Number will be blank if you have replaced the logic board. When in doubt, always check the printed serial number on the machine itself. Where can I find it?