Chosen Solution
My iMac would not boot up today from Sleep Mode. Kept recycling to grey screen, getting 3/4 of way to end of progress bar, then shutting down to black screen, then starting all over, shutting down then starting same process all over all over. Ran internet Hardware test which gave this alert. 4MOT/4/40000003: HDD-1313 Searched for the meaning but nothing comes up. Can anyone tell me what this means? Thanks.
4MOT/4/40000003: HDD-1313 Here’s a good reference to understand what the code means Finding Hardware Faults: Exploring AHT & Apple Diagnostics Basically your HDD fan unit has failed! Here’s the needed part iMac Intel 27" (Late 2009-Mid 2011) Hard Drive Fan We don’t have a guide to get to it but this guide will get you mostly there Installing iMac Intel 27" EMC 2429 Dual Drive Kit (HDD or SSD) Follow it to Step 32 and carefully disconnect the remaining cables to the logic board as the fan is under it.
