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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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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. Crear un USB de Arranque 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!

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