![]() Check Apple Support article HT1159: Mac OS X versions (builds) for computers to make sure system build is correct for this computer model. Computers sometimes exhibit symptoms that indicate the wrong version of OS X system software is installed. General Troubleshooting Update Software and Firmware Important: Before you begin troubleshooting, ensure the correct version of OS X is installed, and check for and apply the latest software and firmware updates. Note: If replacing the VESA mount tongue, write the serial number on the underside of the VESA mount tongue. When replacing the stand, use a fine-tip black permanent marker to neatly write the serial number on the bottom of the new stand. Note: If the computer has a VESA mount, the serial number is located on the underside of the VESA mount tongue. ![]() IMac (21.5-inch, Late 2012, Early 2013, Late 2013, Mid 2014), iMac (27-inch, Late 2012 and Late 2013), and iMac (Retina 5K, 27-inch, Late 2014): Serial Number Location The serial number for iMac (21.5-inch, Late 2012, Early 2013, Late 2013, Mid 2014), iMac (27-inch, Late 2012 and Late 2013), and iMac (Retina 5K, 27-inch, Late 2014) is located on the bottom of the stand. IMac (27-inch, Late 2012 and Late 2013) and iMac (Retina 5K, 27-inch, Late 2014): Overview iMac (27-inch, Late 2012 and Late 2013) and iMac (Retina 5K, 27-inch, Late 2014)įor full technical specifications, refer to /specs.
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