Chosen Solution
Recently my 2011 EMC 2429 Intel i7 27” iMac was showing the flashing ‘?’ when attempting to boot. When trying to reinstall MacOS, disk utility was not showing my internal HDD. Upon further investigation I found out the iMac is not supplying the internal HDD with power thus the drive never spins up. Powering the internal HDD with an external SATA power supply allows the iMac to boot and run successfully with no issue. What do I need to replace to get power to the internal SATA harddrive again? Many thanks!
You’ll need a new power supply iMac Intel 27" EMC 2309, 2374, 2390 or 2429 Power Supply and here’s the guide iMac Intel 27" EMC 2429 Power Supply Replacement
