Apple Hardware Test error
WWhat is error 4MOT/4/0000003:HDD-1243 fron an Apple Hardware Test? On an iMac, 3.1 GHz processor, 4GB of memory running OS X 10.9.5
iMac (27-inch Mid 2011), OS X Mavericks (10.9.5)
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It indicates that one of the cooling fans is faulty and needs to be immediately replaced. Take the machine to any AASP immediately and they will determine which sensor and replace it. Shouldn't be horribly expensive, for estimates call the AASP of choice. AASP Locator