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モデル番号A1312 / Mid 2010 / 3.2 GHz Core i3もしくは2.8 & 3.6 GHz Core i5もしくは2.93 GHz Core i7, ID iMac11,3

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iMac 2010 27" HD Failure and SSD replacement

Hello!

Recently, the internal 1TB HD failed, so we looked for service and replacement.

The official Apple re-seller and support in Greece claimed that the computer is characterized by Apple as "vintage" and would not support the repair and advised to seek for an unofficial service provider .

So, we replaced the internal HD with an SSD (Toshiba TR200 480GB) and installed MacOs Sierra using a bootable Sierra USB Stick and then updated to HighSierra from the App Store. Things looked good but then the system became unstable and constantly restarted, showing a grey screen "Your computer restarted because of a problem".

We tried the same steps - boot from a Sierra USB sick, erasing the SSD, re-installing MacOs Sierra for several tiring times, but the problem kept apperaring!

Does the community have any advice that we could follow?

Update (08/11/2018)

Hello again!

I replaced the Toshiba TR200 with an old Samsung EVO 840 120GB (roughly, as @danj had advised ;)). Installed the Sierra MacOs and updated to HighSierra. Unfortunately, the problem is still there. The grey screen "Your computer restarted because of a problem".

Any advise? Perhaps I should also short-circuit the thermal sensor connection?

Update (09/07/2018)

Dear @danj, since you are most experienced, may I ask an additional question? I just bought the OWC Digital Thermal Sensor. Do you believe that there is any chance that my Toshiba TR200 480GB would work?

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Specs:

Your iMac's system group: iMac11,3

An example of one: iMac 27"3.6 GHz i5 (Mid-2010)

Your SSD Toshiba TR200

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iMac 27"2.9 GHz i7 (Mid-2010) | 16GB RAM | SSD Samsung EVO 840 120 GB

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Did you install the OWC in-line thermal sensor?

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No. Is it mandatory?

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Sorry guy this is a fixed SATA III (6.0 Gb/s) drive from what the spec sheet shows, you'll need to find a different drive. See for your self Toshiba TR200 specs

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Your systems SATA interface is SATA II (3.0 Gb/s) yet the SSD you put in is rated as a SATA III (6.0 Gb/s). In reviewing the spec info it appears this drive is a fixed speed drive so it is not the best match for this system. You either need a slower fix speed SATA II drive or get one that is rated to run at SATA II. As an example Samsung’s SSD: Samsung 860 EVO here we can see this SSD is able to match up with the systems SATA I/O speed.

You’ll need to return the Toshiba drive and get a different SSD. Review the spec sheet or online like I did here making sure the drive is compatible. Here’s another example of a hybrid SSHD drive that you might want to consider: Seagate FireCuda 3.5: SSHD here just like the Samsung drive SATA II is a supported I/O speed.

You also have a bit of a problem with any drive you put in as the systems cooling needs a thermal input from your drive.Your original drive used a social cable to gain access to the built-in sensor. The SSD drive does not even offer access to the needed sensor (any) and the other drive I pointed you to also doesn’t offer the needed access (most HD don’t). Which is why you need to add this sensor: OWC In-line Digital Thermal Sensor for iMac Late 2009 - Mid 2010 HDD/SSD Upgrade.

Lastly, here’s the IFIXIT guide you’ll need to follow: iMac Intel 27インチEMC 2390のハードドライブの交換

That should fix all your issues

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Yankee Zulu さん、ありがとうございました！
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