Replacement HARD drive does not not in 27-inch imac 2012

Hello apologies if this question has been asked and answered before.

I've owned a Mac for many years, I'm comfortable shooting them to make any necessary repairs. My most recent Mac a 2012 13.2 27-inch iMac was a fusion player was not part of the HARD drive, the merger fell apart after the reconstruction of the merger and restore the system, the HARD drive failed this time, I could hear the sticktion in the drive so that was it. I had to put a replacement isn't a problem (so I thought) I did some research and bought a Seagate 3 to 7200 NAS drive to begin with, I thought I leave my machine on ground why not a NAS drive for the operating system.

I had then the car adapter OWC with heat sensor, after getting the iMac apart that I replaced the drive, something I've done before on other Mac waiting for the machine to start with no OS instead, all show the iMac is the SSD it recognizes not the replacement drive at all no prompted me to format the new drive.

I spent some time trying to figure out the problem to reset PRAM, put mode target to see if the disc looks for another mac, no luck in the terminal, the 'diskutil list' only would show only the SSD.

I opened the iMac this time put in a Seagate HDD 7200 3TO standard before putting back together I ran the iMac with attached to another screen. It doesn't seem to matter what I put in the iMac in the car it does not recognize them, I was putting in old spare parts to see if it was a problem with the current firmware. I started thinking to the question could have been the SATA cable until I plugged the original drive in. Immediately the old disk could be seen and mounted perfectly in a last effort I got a model the same SSHD Seagate I checked is intended to be supported with this type of iMac still nothing ditch.

I am at my wits end with this issue, it is as if the original is savvy to the system some how I read that 2009 iMacs had problem s similar I don't understand other iMac of the same model that the mine had the problem of fan speed and any player could be used. It aims to be a kind of firmware I am destined to load in the new drive.

My options are very limited and for once I feel lost and let down by apple if it is worth $800 and $1000 to get the same 1 TB per apple apple player or as RESTful seems much this repair is already in me for $1200 (I have cracked the screen of origin)

If any advice is much appreciated. My idea lasts is put back together and just start the operating system on an external drive to USB 3. The current SSD is too small for my image of time machine only 128 GB to restore to.

Concerning

digi79

A few thoughts here.

Is it possible that the OWC adapter is faulty or well you don't connect it correctly? http://youtu.be/iWyJxnBM-Qu Unless I read wrong looks like the original drive is recognized and original SATA cable, but when you add the adapter into the mix, it does not work?

Have you tried partitioning and firmatting the disk before you install it? Sometimes, who will do the trick.

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