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모델 A1312 / Mid 2010 / 3.2 GHz Core i3 또는 2.8 & 3.6 GHz Core i5 또는 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?

답변되었습니다! View the answer 저도 같은 문제를 겪고 있습니다

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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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맥북 배터리 수리 키트

기본 가격은 $69.99

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선택된 해법

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" EMC 2390 Hard Drive Replacement

That should fix all your issues

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