If your iMac desktop doesn't turn on, has a black screen, burns out, or has a failed power supply, replacing the power supply maybe the answer. This 300W PA-1311-2A power supply board is the perfect solution for your computer to randomly shut down and other defects. Compatible with iMac 27" A1419 Late 2012 to Mid 2017: iMac13,2 Late 2012: MD095LL/A or MD096LL/A, iMac14,2 Late 2013: ME088LL/A or ME089LL/A, iMac15,1 Retina 5K Late 2014: MF886LL/A, iMac15,1 Retina 5K Mid 2015: MF885LL/A, iMac17,1 Retina 5K Late 2015: MK462LL/A or MK482LL/A, iMac18,3 Retina 5K Mid 2017: MNE92LL/A or MNEA2LL/A or MNED2LL/A. Compatible with iMac 27" Retina 5K Display A2115 (Early 2019-2020): iMac19,1 Retina 5K Early 2019: MRQY2LL/A or MRR02LL/A or MRR12LL/A or BTO ,iMac20,1 Retina 5K 2020: MXWT2LL/A or MXWU2LL/A or MXWV2LL/A or BTO. Identifying Numbers: APN : 661-7170, 661-7886, 661-03524,661-12714 PPN : ADP-300AF-T, PA-1311-2A. Each a1419 power board is individually tested and guaranteed to function perfectly. Replace a broken or damaged power supply board for iMac Intel 27" A1419 (Late 2012-Mid 2017) A2115 (Early 2019-2020) and fix problems with randomly shutting down (on and off) and black screen.   Compatibility: Compatible with iMac 27 inch A1419 (Late 2012-Mid 2017) -Compatible with iMac Intel 27" Late 2012 A1419 (EMC 2546) iMac13,2 Late 2012: MD095LL/A (2.9 GHz Core i5) or MD096LL/A (3.2 GHz Core i5) or (3.4 GHz Core i7) -Compatible with iMac Intel 27" Late 2013 A1419 (EMC 2639) iMac14,2 Late 2013: ME088LL/A (3.2 GHz Core i5) or ME089LL/A (3.4 GHz Core i5) or (3.5 GHz Core i7) -Compatible with iMac Intel 27" Retina 5K Display (Late 2014 & 2015) A1419 (EMC 2806) iMac15,1 Retina 5K Late 2014: MF886LL/A (3.5 GHz Core i5) or (4.0 GHz Core i7) iMac15,1 Retina 5K Mid 2015: MF885LL/A (3.3 GHz Core i5) -Compatible with iMac Intel 27" Retina 5K Display (Late 2015) A1419 (EMC 2834) iMac17,1 Retina 5K Late 2015: MK462LL/A (3.2 GHz Core i5) or MK482LL/A (3.3 GHz Core i5) or (4.0 GHz Core i7) -Compatible with iMac Intel 27" Retina 5K Display (Mid 2017) A1419 (EMC 3070) iMac18,3 Retina 5K Mid 2017: MNE92LL/A (3.4 GHz Core i5) or MNEA2LL/A (3.5 GHz Core i5) or MNED2LL/A (3.8 GHz Core i5) or (4.2 GHz Core i7) Compatible with iMac Intel 27" Retina 5K Display A2115 (Early 2019-2020) -Compatible with iMac Intel 27" Retina 5K Display (Early 2019) A2115 (EMC 3194) iMac19,1 Retina 5K Early 2019: MRQY2LL/A (3.0 GHz Core i5) or MRR02LL/A (3.1 GHz Core i5) or MRR12LL/A (3.7 GHz Core i5) or BTO (3.6 GHz Core i9) -Compatible with iMac Intel 27" Retina 5K Display 2020 A2115 (EMC 3442) iMac20,1 Retina 5K 2020: MXWT2LL/A (3.1 GHz Core i5) or MXWU2LL/A (3.3 GHz Core i5) or MXWV2LL/A (3.8 GHz Core i7) iMac20,1 Retina 5K 2020: BTO (3.6 GHz Core i9)or(3.8 GHz Core i7) or (3.6 GHz Core i9) -Both of the Model and EMC Number are l