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2011년 상반기 모델, A1278 / 2.3 GHz i5 또는 2.7 GHz i7 프로세서.

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Early 2011 MacBook Pro has prohibitory sign on boot after SSD upgrade

This problem has been happening ever since I installed this new SSD.

I recently bought a Lexar NS100 256GB SSD for my MacBook Pro, as the HDD inside was painfully slow in macOS. I received it and as soon as I got it in, I decided to install Mac OS X Lion, just to see how fast it was. After install, it booted just fine with no problems at all. Apps opened quickly and swiftly. So, I decided to run Internet Recovery on High Sierra. I formatted the drive twice before installing it. As soon as it restarted, I got a prohibitory symbol. It would flicker between the Apple logo and the symbol, sometimes booting into macOS fine after. But, this problem has been noticeable on Windows as well, with the OS refusing to boot until I restart a couple of times. Other people online who have had this issue seemed like it’s the hard drive cable. But it seems to be in pristine condition (that might be because my eyes are kinda bad too). I have another laptop to try the SSD in, but I just want to make sure that this is the confirmed problem before I spend my money on a new cable. Here’s a video of the laptop going to the prohibitory sign, then booting completely fine after.

Update (09/01/2022)

@danj

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And so @CGamez? Was the problem solved by changing the HD SATA cable?

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There's two things needed here to over come this first is to leverage the Startup Manager to select the boot volume.

Reference: Mac startup key combinations

That will allow the system to boot up. Then open your Preferences > Startup Disk so you can set it permanently. That should do it!

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I’m not having issues with not being able to boot into the correct OS, I’m having issues with both OSes not being able to boot correctly. It should boot without problem but usually requires multiple restarts.

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@CGamez - Sorry the way you titled the question is what I was focused on as the video you posted is damaged.

You'll need to do two things! Install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see 기존 질문에 이미지 추가하기 So we can make sure the battery and the charging logic is working correctly.

I would also run the onboard diagnostics to see if something pops within it. Restart your system and press the D key. let us know what the errors are

Reference: Mac startup key combinations

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@danj Ok, will do. Thank you.

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@CGamez - The batteries age is long in the tooth! While the cycle count is just about 3/4 quarters used. So depending on your plans its time to look at replacing it soon. MacBook Pro 13" Unibody (Mid 2009-Mid 2012) Battery and here's the guide MacBook Pro 13" Unibody Early 2011 배터리 교체

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I mean, I just wouldn’t think it’s the battery because I normally use the laptop on its cord most of time. I barely use it on battery charge, because of the low battery time.

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