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Questions tagged [boot]

Questions about booting, the process of starting a computer and putting it into a state of readiness for operation.

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Cannot boot APFS Volume after time machine restore

First time i've seen this, but had a kernel panic from an installation, so booted into recovery, did a time machine restore. The log says it completed successfully, but upon boot I get the message: "...
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1answer
31 views

kernel panic – MacBook Pro 2011 won't boot, keeps restarting

My MacBook Pro 17" Late 2011 is suddenly unable to boot, keeps restarting over and over again, like 10-20 times until it decides to shut down. As it restarts each time, it displays a message like this ...
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11 views

Any way to repeatably assign a disk ID for a Fusion Drive hdd?

When mounting my fusion drive at boot time, sometimes the hdd is assigned disk0 and ssd is assigned disk1; other times these assignments are reversed. Is there a way to ensure that the id assignment ...
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0answers
59 views

Boot Partition suddenly inaccessible

I've run into quite a problem - my Mac (mid 2015 21.5" 4k iMac, running Mojave) cant find my boot partition (disk0s2). I've made some headway, it previously just showed it as FFFFFFFF-FFFF-FFFF-FFFF-...
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1answer
30 views

Mojave 59 second hang

About two weeks ago, my Mac started hanging on boot. It has been driving me crazy. Today I looked at the logs in /var/logs/system.log and on every boot I can see a 59 - 60 second hang, exactly. And ...
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63 views

Unable to boot into MacBook Pro after macOS Mojave upgrade

I tried to install macOS Mojave on my MacBook Pro. It failed, but when it rebooted, it can't read the hard drive. I tried booting it into Recovery Mode, but First Aid says that it found an error and ...
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11 views

Recovery USB doesn't work

I followed tutorial to create bootable USB stick with Mac OS Mojave and then from System Preferences --> Startup disk I selected USB drive and restarted my Macbook Pro and after boot I see:
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55 views

Cannot install Mojave via USB drive on new 2018 MacBook pro

Hey I have a new 15" MacBook Pro with High Sierra installed. I want to do a clean install of Mojave. I have followed the instructions at https://www.macrumors.com/how-to/clean-install-macos-10-14-...
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21 views

Failure to update from macOS 10.12 to 10.13 [closed]

Mid 2012 MBP: i5 16GB RAM What I’ve tried Boot from USB installer - macOS could not be installed on your computer A boot helper partition is required when working with Core Storage. Quit the ...
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24 views

Unexpected shut downs on MacBook Air '15 with code -128

I have a MacBook Air, Early 2015, running macOS Mojave. Over the last 2 weeks, it has been unexpectedly shutting down and rebooting over varied time periods. Upon checking the shutdown logs, I found ...
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1answer
24 views

Installed refind to a separate HFS+ partition alongside macOS 10.14, but can't set it as the startup disk

I use refind as my boot manager on my 2015 MacBook Air. Originally I had it installed on to my internal drive's EFI partition (and installed it in the recovery environment) but every time I update ...
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1answer
72 views

Bless error when installing rEFInd

I am trying to install rEFInd on my MacBook Pro 2018 laptop with the new T2 chip that adds extra boot security. I have both used APFS and MacOS Extended (Journaled). I have also disabled secure boot ...
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36 views

Will my Mid-2012 Unibody MBP boot from an SSD containing Linux?

I have an SSD from another laptop that has Ubuntu Linux installed on it and fully working. It's a standard UEFI Ubuntu install using the GRUB bootloader, and the entire SSD is used (i.e. there are no ...
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0answers
24 views

Which NetBoot Server Am I Booted From?

Is there a way I can tell which NetBoot server a client machine has booted off of, from within the client machine itself? This is kind of an obscure question, but I am in an environment that has two ...
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0answers
11 views

Mac Mini Failing Half Way Through Boot

I am, however, able to boot up from this hard drive using Target Disk Mode, from my Mac Book Air (via a Lightning cable). And it runs fine via external boot like that. I was able to do an external ...
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0answers
18 views

Can I mount all volumes on the internal/boot APFS container before startup tasks run?

Programs that run on startup are either not starting (httpd) or are starting with the wrong preferences (Alfred). I suspect its because the APFS volumes on the container where I store some of the ...
3
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1answer
101 views

Can't start Mac in recovery mode - only get folder with question mark instead

I can't start my MacBook Pro 2017 using controlR, controloptionR, or shiftcontroloptionR. For all combinations I only get the folder with a question mark shown. What can it mean and how can I fix ...
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1answer
102 views

macOS Mojave Installation

I have downloaded macOS Mojave from some other website due to Mac App Store download problem. So now I have to boot the installation file, to do so the help box of the website says I have to press and ...
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0answers
38 views

Trouble rebooting from Mojave to High Sierra

I have High Sierra installed on a partition of my MacBook Pro’s internal SSD, and Mojave installed on a partition of an external drive. If I have selected the High Sierra boot volume in Startup Disk ...
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0answers
30 views

Possible to boot Mac Pro from two PCIe M.2 AHCI PCIe SSD in RAID 0 on macOS High Sierra?

I have an M.2 AHCI PCIe SSD and I am considering purchasing a second one to install both in a 2009 Mac Pro in a RAID 0 configuration using Disk Utility similar to the setup in this video. I have used ...
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1answer
31 views

Mac Mini 1TB HDD being 100% full - cant mount, cant boot

I just unburied an old 2007 Mac Mini Server which I had put a 1TB drive into. I had kinda forgotten why it broke, but after a while I remembered...the hard way. That Mac's hard drive is so full and ...
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0answers
38 views

rEFInd - can boot to Mac Recovery or Ubuntu, but shuts down after loading bar for MacOS

I have rEFInd installed on my 2015 rMBP - I can access the boot menu for rEFInd (although sometimes this doesn't appear / runs very slowly), and all the right options are there, but when I select ...
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1answer
30 views

MacBook Pro not booting

I have a mid 2010 MacBook Pro that won't boot up. Faced this problem quite a while ago, so i sent it in for repair and was told the logic board may need replacement. The store told me they tested my ...
2
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1answer
41 views

Unwanted GRUB on macOS High Sierra

While installing Linux Mint 19 to a USB, I managed to get GRUB installed on my Mac hard drive. I can still boot to the macOS if I hold the Option key down. How can I remove GRUB and revert my Mac ...
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1answer
26 views

Getting a 🚫 sometimes on boot

On a Mac mini end 2009, with a drive updated to a SSD, and RAM updated to 8GB running OS X 10.11.6, I sometimes get a "🚫" on boot. It then boots in Recovery mode by itself, so i shut it down and ...
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1answer
67 views

How do I make an external USB bootable?

My main HD has 222GB in use, and is formated OS X 10.10 Yosemite (latest). I am marrried to 10.10, no time to upgrade. I bought a 256GB (244 reported) USB stick (Sandisk midrange, their $56 midrange) ...
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1answer
20 views

Every time I turn on macbook pro I get menu for choosing startup disk

Every time when I turn on my macbook pro mid 2014 I have to choose my startup disk to continue with booting. It behaves as if I am holding the option key... However, the right option key doesnt work ...
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79 views

macOS High Sierra: This disk cannot be used to startup your computer

I have an Air'13. I used to have bootcamp with win7 and removed it then. Now I want to install High Sierra update and I get message This disk cannot be used to startup your computer. diskutil list ...
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1answer
45 views

Does resetting NVRAM reset EFI Boot Order?

I've had a Macbook Pro for a year or so now and have experimented with quite a few Linux distributions which have added and changed things in the EFI Boot Order. I am looking to clean things up. The ...
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0answers
14 views

MacBook Pro internal Hard Drive booting up in READ-ONLY Mode

I just recently replaced my mid-2012 MacBook Pro's HDD to SSD. I used SuperDuper! to clone my disk into the new SSD and everything seemed to have worked fine, until some repeated boot ups. What I am ...
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69 views

Can't create a bootable USB for my MacBook Pro

I can't create a bootable USB for my MacBook Pro. I know all the steps. The only problem I have is that my main computer is running macOS 10.14 Mojave and I can't see to open any macOS lower than that ...
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0answers
22 views

Boot partition missing:

My 2010 Mac Mini (High Sierra 10.13 and upgraded 500GB Intel SSD 840 EVO) won't boot into the mac side. I bootcamped it several years ago with a copy of Windows 7. It can still boot into the Windows ...
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0answers
20 views

Option to boot into Windows missing after Boot Camp Assist

I just completed installing Windows using Bootcamp Assist. I allocated 30 GB to the Windows partition. The process completed after taking a long time (> 7 hours), and a Bootcamp partition has been ...
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1answer
302 views

Missing Firmware Partition after NVRAM reset in MacOS High Sierra

Maybe someone can help me. Earlier today, I was working on my MBP and it wouldn't read my external flash drive, yet it read it last night before I ejected it. However, today it wouldn't find it. I ...
3
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1answer
120 views

How to stop mac from default booting in deleted windows via boot camp?

I bountied this question Boot into Mac from Windows after failed Bootcamp after being trapped in Windows hell on my mac, after the first time using boot camp. When I got back to my mac I erased ...
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1answer
38 views

Can't enter Apple Hardware Test Mode on my macbook pro

I have an Early 2011 MacBook Pro. When I hold down D immediately after restart, it boots to the normal login screen. When I hold down ALT+D (with a working wifi connection before the reboot) the same ...
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2answers
59 views

How To Let My MBP know that a USB is bootable?

I have got Unetbootin and have put the files onto my drive which is properly formatted as MS-DOS(FAT) and GUID. I have several folders and files: [BOOT], boot, casper, dists, EFI, install, isolinux, ...
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3answers
123 views

Boot into Mac OS X Snow Leopard 10.6 on a 2015 MacBook Air

I have an external SSD containing a bootable installation of Mac OS X Snow Leopard 10.6. It also contain some software crucial to my use. Can I boot into it using my 2015 13" MacBook Air?
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1answer
6k views

My Mac repeatedly beeps three times on startup. What does this mean?

When I try to boot my Mac I get nothing but strange beeps. They beep as follows: BEEP BEEP BEEP [3 second pause] BEEP BEEP BEEP [3 second pause] and it continues until I power off. So far, I have: ...
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2answers
44 views

Boot Camp keeps booting to Ubuntu instead of Windows

I have a macos and Windows 10 already installed. I went ahead and installed ubuntu via EFI, and I think I really messed something up. Every time I boot and select Windows it goes to the purple ...
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1answer
265 views

How to upgrade boot rom firmware without an original drive

I have a 2015 MacBook pro that I am in the process of refurbishing. I purchased it used and it was missing many parts (wifi card, IO board, SSD). I have replaced all of these parts and purchased an ...
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1answer
63 views

2016 MacBook Pro won't get past the Login Screen

My laptop running 10.13.6, has been working great without any issues until I restarted it on Monday. After I logged in, it got stuck on the loading screen and displaying a loading icon for over an ...
2
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1answer
19 views

Black console screen shows up during boot (verbose mode not turned on)

Over the past few months when my Mac boots up, the grey screen with the apple disappears and is replaced with a unix style console screen, which scrolls like a linux PC booting up. I have tried ...
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2answers
41 views

Does booting a 2015 iMac from an external disk require “touching” the internal disk?

The hard drive (a Fusion Drive) on my 2015 iMac has become badly corrupted, possibly getting into that state via some incompatible ram that had previous been installed in it. (The ram was removed and ...
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1answer
116 views

Boot Camp Assistant stuck on creating partition due to EFI formatted as NTFS

Boot Camp Assistant is stuck on ‘create a partition’. I have followed the guide as answered in the question Boot Camp Assistance is stuck on create a partition? but it didn't work after step 8. After ...
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1answer
272 views

rEFInd is not working in macos high sierra 10.13.6 on 2018 MacBook Pro 13 inch even after proper installation

I have installed rEFInd in my mac by going into recovery mode -> open terminal -> csrutil disable -> cd "/Volumes/Macintosh HD/Users/username/Downloads/refind-bin-0.11.2" -> bash ./refind-install -> ...
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1answer
61 views

Missing Operating System

So I recently made a post about my Mac not recognizing USB's or Boot. here's the link : MacBook Wont Boot or Recognize USB. Anyway this is an update. So my 2009 MacBook is still not working. It doesnt ...
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0answers
29 views

MacBook Wont Boot or Recognize USB

So I recently tried to downgrade to El Capitan from High Sierra using a bootable USB. All went well until I deleted the hard disk and the hard disk's volume which is a big no no. Afterwards I tried ...
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0answers
25 views

how can I troubleshoot a long “hang” during boot?

Since I reinstalled OS X 10.13.6 on my MacBook Pro (mid-2015, 2.8 Ghz, 1TB SSD), I've noticed that when it gets to about 4/5 of the way through the boot sequence, the progress bar stops for at least ...
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1answer
37 views

How can I reinstall Mac OS 9 on a G3 PowerBook's original hard drive?

I have a PowerBook G3 from 2000 or so and would like to put Mac OS 9 on it for nostalgia reasons. There are games that simply don't perform well with SheepShaver, plus networking with SheepShaver isn'...