Are you having a problem and wondering if your Mac is still under warrantee? Are you about to buy a used Mac or iPhone and the owner says there is some warrantee left?
If you have the serial number, you can find what information Apple has on your warrantee with this web page: https://selfsolve.apple.com/agreementWarrantyDynamic.do
It can be a real pain to find and read the really tiny serial number sticker on a modern Mac, iPod or iPhone (or maybe my eyes are just going downhill). The serial number on a Mac can be under the battery of a laptop, on the bottom, on the back of a tower, or under the base of an iMac. The serial number on the back of a pocket-sized device can actually rub off if it was printed with ink.
Much easier, you can copy and paste the serial number from the “System Profiler” utility. Its in the “Hardware Overview” information which comes up first by default. You can find the System Profiler in the “Utilities” folder in the “Applications” folder, or you can go to the Apple Menu, select “About This Mac”, then press the “More Info” button.
For an iPhone, iPad, iPod Touch, you can find the serial number in the Settings App, under “General” -> “About”. It won’t do you much good for copy-and-paste on the device, but you can also get the serial number from iTunes when the device is connect to your computer.
If you bought an AppleCare extended warranty, but the site only shows a 1-year warranty, it may be that the extended warranty didn’t get registered. (The registration instructions should be in the box.) It may or may not have been automatically registered if you bought the computer and AppleCare together at an Apple Store. You do have to buy an AppleCare extended warranty while the original 1-year warranty is still good. If you bought it, but didn’t register it before the end of the original warrantee, you may have to call Apple or talk to someone in an Apple store and show them the purchase receipt showing both the Mac purchase and the AppleCare purchase. Someone can then re-instate the extended warranty.
If you didn’t buy a warrantee, the page may present you with a button to buy one on the spot. I just tried it with my iPhone 3GS and it offered me 2 more years of AppleCare for $69.

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