Chosen Solution
Hi everyone, I changed the HDD of my iMac 27 “in mid 2011. After some research I saw that the OWC in-line digital thermal sensor hdd upgrade cable was also needed. I replaced / added the 2 components and turning on the iMac it reaches the login screen and then restarts. Using the Apple Hardware Test I discovered this error: 4MOT / 4/40000002: HDD-0. What is the reason for this error if the HDD and sensor are new ??? I also tried to set the fan speed behind the HDD but it remains constantly at 0. Do I have to replace the fan ??? Thanks a lot to everyone!
Ouch! You’ll need to open the system again and this time you’ll need to pull the HDD out and logic board 1/2 out to gain access the HD fan just behind it iMac Intel 27” (Late 2009-Mid 2011) Hard Drive Fan as iFixit is out of stock you’ll need to look elsewhere 27” iMac 27 Fan - Hard Drive, Apple P/N 922-9872 (used)
Hi everyone, I replaced the fan as @Dan suggested but the error remains. At this point the problem could not be the power supply or the logic board ??? Thanks a lot to everyone!
