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모델 A1418 / Late 2012 / 2.7 & 2.9 GHz Core i5 또는 3.1 GHz Core i7 프로세서

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Constant fan blank screen

Ill start from the beginning…

One morning i had the no symbol icon when I went to turn on my iMac. Ran the Apple Diagnostics and the only error I got was a sensor error for the SSD from OWC.

I sent them back the drive. I put in the original drive and worked fine and no more error. They sent me a replacement. While I had the iMac open i decided to go one step further and take out the logic board and clean the CPU (Applying some fresh arctic thermal paste) and heatsink and fans.

All this I have done once before when I put the SSD in. Since i was there I decided to change the CMOS battery with a new one just because it was there and they are cheap. I put everything back together and im confident I have every cable secure in there.

I tried to reset the PRAM /SMC but its still the constant fan on and blank screen. I am currently going to take it back apart and again very carefully go through everything step by step just to make sure…

Any ideas? Thanks

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When its in this state do you see any glow from the backlight? What does an external display show you.

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I currently have it apart again logic board out going over everything with a fine tooth comb. I believe it was as black as could be. I dont recall it being illuminated at all...maybe the lcd cable wasnt in tight although i do not believe that to be the case but maybe and hopefully....going to put back together again soon

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It was hard to tell but i BELIEVE the problem was one or two of the pins on the CPU were bent. Was very subtle tried to straighten them out but didnt work. Bought a new logic board and now im stuck…has the folder with question mark icon that comes up. I booted to a Mojave installer and tried to just reload the OS and it says the firmware for the computer needs to be updated first. Any suggestions? thanks

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Alright so I took apart the imac again removed the Airport card and reseated it just incase. Prior to all this I had no issue with the wifi. Ethernet appears to be working now. I installed bootcamp with Windows 10 and still no Wifi. Bluetooth works and arent they on the same card? Is that odd that bluetooth is working but wifi is not? I reinstalled Mountain Lion via USB installer since thats that it came with and installed some updates for that OS and still no wifi…Not sure if I spend the money on a new airport card or send the logic board back and try a different one? Can this airport card be updated to a wireless AC card?

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You’ll need to contact OWC to get the updated firmware for your SSD.

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Ok so I reached out to OWC they suggested to try the internet recovery back to factory OS which I believe is Mountain Lion but that didnt work. I put in the original drive which had Sierra and i upgraded it to Mojave via USB installer. Once I got back into the OS I noticed I have no Wifi and the Ethernet doesnt work. Maybe problem with Logic board (said to have been fully tested from working maching) maybe not? I put in a USB ethernet adapter and that is working. Im currently installing updates but im not sure what else to do? Should i try to reinstall mountain lion through USB installer or try again from the internet recovery? Thanks

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Does sound like you have a logic board problem. Was this a replacement board?

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Ok this has been a long project. But im all done. The original problem I believe was a bent pin or two on the cpu socket although it was hard to tell. The 2nd problem was maybe a bad replacement board. I got another replacement for that and all seems well. I used a HDD to upgrade all the way to Mojave then swapped back to my SSD and everything appears to be working. Mark this as closed if possible. thanks

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Thats great news!

Please take the time to score the answer and accept it as resolved.

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