Can’t boot to recovery mode

Question

iMac Intel 27インチ Retina 5K ディスプレイ

対象のモデルはA1419 / EMC 2806 / Late 2014 または Mid 2015。 3.3 または 3.5GHz Core i5 または 4.0GHz Core i7 (機種ID iMac15,1)、EMC 2834 late 2015 / 3.3 または 3.5 GHz Core i5 または 4.0 GHz Core i7 (機種ID iMac17,1)のRetina 5Kディスプレイを搭載したすべて。

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Fxguy1 @fxguy1

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投稿日: 2024年1月24日

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Can’t boot to recovery mode

I installed a 1TB blade drive in my 27” late 2015 iMac. Since then I tried upgrading to an SSD for the main drive and everything went haywire.

Currently it is SLOW as molasses (the reason for the upgrade) and I can boot into the original drive with OSX High Sierra on it. When booted to that I see both HD on the desktop. I p-need Disk Utility and it didn’t see them or froze. I try restarting holding down Command-R to boot into internet recovery mode and it starts up with the chime and Apple logo but that’s where it stays?

Any help appreciated!

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Jadon @jadonlyon 評価: 1.6千 13 4 2 · Answer 1 · 2024-01-25T10:32:55-07:00

Same issue, but with a MacBook Pro Early 2011.

Here's what I did to fix this: I first attempted to boot in Internet Recovery (Option + Command + R at startup). That didn't even work for me. So, using a separate Mac, I made a bootable USB Drive. 起動用USBを作成する方法 The Mac was able to at least boot at that point.

After I formatted the SSD, I reinstalled macOS using APFS. And yes, by the time macOS installed and I got back into the desktop, IT WAS SLOW!!!!! Like, way slower than with the Hard Disk (HDD) Drive.

After spending many, many hours on the internet looking for a solution, here's what I found: You need to activate TRIM Support. After loading into the Desktop, open Terminal, and type sudo TrimForce Enable. You will need to type Y several times, and then eventually the Mac will Reboot. After that, the Mac should be running just fine.

To make sure TRIM support is enabled, go to the Apple Menu  > (While Holding Option) System Information... > SATA > TRIM Support. If it says "Yes," you're good to go. If it says "No," punch in the command one more time.

Hope this helps, best of luck!

iMac Intel 27インチ Retina 5K ディスプレイ

Can’t boot to recovery mode

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