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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18 views

MBA (2013-15?) wont boot from macOS boot stick

A friend of mine somehow managed to delete his internal drive including the recovery partition while trying to reset his MacBook to factory settings. Now when trying to boot up the MBA only displays ...
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50 views

MacBook Pro 13" Mid-2010 - upgrade HDD to SDD with intermittent Prohibitory sign

Good morning folks, I can't wrap my head around this one. I recently upgraded a failing 250 GB HDD to a 1 TB SSD and transitioned the data using a hard drive duplicator. When starting from a cold ...
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14 views

How do I prevent repeated iCloud logins when switching boot disk?

I've several different APFS bootable volumes. When I restart, and switch from MacOS 13 to 15, or back to 13, after I log into my user account, I'm asked to re-authenticate on iCloud. It seems that ...
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34 views

How to get DMG file for making macOS USB on Windows PC?

I saw this discussion and updates on StackExchange on making macOS USB on Windows. I'm unable to comment there, so I'm posting a new question. I have been trying everything from that page, but as of ...
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16 views

Macbook shut itself down during sleep and won't boot unless leave it for a few days

model: macbook 13'3 with retina display (2013 late autumn) OS: 10.10.5 symptons: The macbook shut itself down while I put it to sleep with amost 60% battary left; Won't turn on by pressing power ...
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1answer
24 views

Can't boot from USB or reset PRAM/NVRAM on mid-2006 iMac

I got a free mid-2006 iMac from a friend, and while it boots to the login screen, all the user accounts are password-protected, so I've decided to try reinstalling Mac OS X Leopard. I created a ...
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1answer
64 views

SSD drive partition showing as FFFF on my MacBook Pro 2010

About three years ago I replaced my original hard disk on my 2010 MacBook Pro with SSD drive to make the system run faster. It did work fine until now. Regrettably I'm in this position now as my ...
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24 views

Mac boot partition FFFF (High Sierra) [duplicate]

I know many people have had similar kind of issues and I tried to fix this with the answers I found but with no luck. Device: iMac 27" mid 2011 OS: Latest High Sierra (I think the recovery mode is ...
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2answers
75 views

“No administrator was found” in Startup Security Utility

My friend got a new MacBook Pro from office, later on he resigned and in a hurry erased the "Macintosh HD", now we are trying to install Mojave using Bootable USB but it won't allow because "External ...
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1answer
56 views

Your computer is disabled. Try again in 60 minutes

I need to factory reset a MackBook Pro. Every time I start it up it takes ages to load and then I see this: Your computer is disabled. Try again in 60 minutes. I tried to restart the Mac with CMD +...
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1answer
35 views

Cloning macs within a context of no internet access

I'm shipping a project which my client (the army) wants to run on new MacMinis2019, which they, being less tech saavy consider a whole (the mac with all the software and configuration installed on it ...
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25 views

Problems with bless tool

The computer is an early 2015 13" MacBook Pro. Two weeks ago we sent my spouses 15" in for battery recall, and bought an OWC Aura Pro to replace my internal 1GB SSD (we SuperDuper'd her 15" MacBook's ...
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1answer
59 views

How to stop macOS updates from taking over the rEFInd boot manager? [duplicate]

I have rEFInd installed on the EFI partition of my 2015 MacBook Air. Every time I update macOS, it ends up taking over the bootloader and resetting it to using the macOS operating system. Afterwards, ...
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1answer
25 views

System fails to recognize main macos boot partition after Ubuntu dual booting attempt

I recently attempted, and temporarily succeeded, in dual-booting Ubuntu and MacOS Mojave on my MacBook Air. After I installed and successfully tested Ubuntu, I tried to use Disk Utility to create a ...
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27 views

Mac Pro just turns off instead of entering safe mode

I'm trying to deal with an old Mac Pro (I'm not sure how old) which will not boot - it shows the grey screen with the Apple logo, and the progress bar rushes up to 50%, then slowly creeps up to 100%, ...
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21 views

MacOS Boot Error

I hope I am able to explain the problem accurately and with sufficient detail. The problem started with the flashing folder at boot up. I used the Command + r option to get into recovery mode. ...
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1answer
37 views

MacBook Air 7.1 (early 2015) freezes for five to ten minutes after login

Recently, my MacBook Air 7.1 (early 2015) has been very slow on startup. That is, the system boots quickly, and then I'm able to login, and the desktop begins to load. Initially, I have control and ...
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1answer
37 views

mac won't start after “sudo chown -R $(whoami) $(brew --prefix)/*” command

I tried to install a program and it alwaysed lacked permission on /usr/local. I tried sudo chown -R $USER /usr/local but then found out that doesn't work anymore with High Sierra. So I tried sudo ...
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31 views

How to create bootable installation media for Mojave without erasing the target drive

I would like to use my existing external ssd (500GB) as a bootable Mojave installation disk. But I don't want to erase the contents or format the drive. This page has the general instructions https://...
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1answer
55 views

Stuck during clean install on a new SSD on a late 2009 iMac

I hope you might be able to help me out since I am completely stuck in my attempt to perform a clean install of High Sierra on a late 2009 iMac (model number A1311 – does not have Internet recovery) ...
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1answer
66 views

When does software take over firmware during boot in Macs?

This is for me the $1 million question I’ve never had a certain answer about. I learnt long ago that in newer 32bit-64bit PCs the initial phase of the startup process is controlled by firmware and is ...
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0answers
30 views

Macbook Pro stuck after I enter user password, screen starts to switching off and on while loading is stuck

Yesterday everything was working fine. Today, when I turned on macbook, enter the password as usual and in 60-75% of loading bar - screen starts to turn off and on. When screen turned on again, there'...
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34 views

Dual boot bootloader problems - Mac & Linux

I recently stumbled upon a problem with default MacOS bootloader. The scenario is next: My Macbook pro 2012 only has one 256 GB drive from where I specified 70 GB's of space to be used as Ext4 ...
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1answer
39 views

NVRAM Showing Questionable Payload Variables… Can anyone verify if this is normal?

I used the terminal command in macOS 'nvram -xp': student:~ admin$ nvram -xp <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www....
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1answer
33 views

How to go to boot options?

I have a MacBookPro Retina 13" early 2015 and I can not enter the boot options. The Device is running OS X El Capitan. I have tried the following things with no luck: Attempt 1 - Hold the Option ...
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64 views

Error “No bootable device — insert boot disk and press any key” after trying to boot into Windows

today I was going to boot into my Windows partition and went into System Preferences and chose to boot into Windows and pressed Restart. After I did this all I got was "No bootable device -- insert ...
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1answer
27 views

Cannot boot into Ubuntu installed on an external SSD after installing Windows with Boot Camp

I have a MacBook Pro running macOS Mojave and an external SSD with Ubuntu installed on it. The way I swapped between macOS and Ubuntu was by pressing the Option/Alt during boot to choose between ...
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3answers
66 views

Is it possible to downgrade Boot ROM SW to try and fix unbooting Late 2012 iMac from Single User Mode?

I currently have 283.0.0.0.0 Boot ROM SW installed on my crippled Late 2012 iMac - which I upgraded HDD->SDD, tried to unsuccessfully install Mojave, then broke fusion setup, erased drives and am now ...
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31 views

Can't login to mac after using single user mode for a password change

Was working on a friend's Mac and required a password she couldn't remember. Used single user mode as a start up option and changed the password and rebooted but then was unable to login. It lets you ...
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19 views

External hard drive is not recognized by MacOS after trying to install something on it

Can someone help me with this? (without having to format it) Here's the table start size index contents 0 5859790848 MacBook-Pro-de-Elias:~ ///$ sudo gpt show /dev/...
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1answer
43 views

Glitch or bad design during booting on Mojave?

After enabling FileVault with recent T2 firmware patch the loading bar looks weird like its missing pre-cached image: I replaced default Mojave.heic with a test image and gray "transparent" area kept ...
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42 views

How do I use Single User Mode to fix blank internal drives on Late 2012 iMac when root is USB Mojave

I am having a lot of problems with my Late 2012 27" iMac not booting (and not letting me install, run diagnostics tests etc)... Ok... I'll try and keep this short as possible... Late 2012 3.4Ghz 8MB ...
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1answer
47 views

Are there any risk of bricking the macbook by cloning to a partition?

I'm currently using a mac with 3 bootable partitions (multiboot). MacOS, Ubuntu and Arch-Linux. I can switch between the operating systems using rEFInd I mostly only use Arch-Linux but only gave it ...
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0answers
32 views

Boot a Mac with WiFi turned off [duplicate]

Is there any way to boot a Mac with WiFi turned off completely, until manually turned on again? (And to be precise - it should be turned off completely and not just disconnected from a network.) The ...
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0answers
17 views

Hard drive won't mount (not visible) when connected to internal SATA ribbon

I have an old macbook pro (I think from 2013, but I am not sure), and the hard drive (WD blue 750gb WD7500BPVX, something like this) is broken (I think). Basically I can see it from the disk utility ...
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1answer
60 views

MacBook 2,1 OS X 10.6.8 - Boot screen loop

My MacBook2,1 is stuck in a loop on boot screen. It flashes from ?Folder, to an also flashing net recovery globe, and every so often an Apple logo for a few seconds, but never actually boots into the ...
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1answer
172 views

Lost my APFS partition after using EaseUS partition manager on Bootcamp

I used macOS mojave(APFS partition) and Windows10(Bootcamp). And I tried to expand Bootcamp partition with moving Windows OEM partition by EaseUS partition master in windows. After this, I can’t find ...
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1answer
29 views

Macbook restarts when logging in

My Macbook Pro (Mid-2015, Mojave) restarts after I type my password to log in. The progress bar fills to about three-quarters before this happens. I have tried: Resetting PRAM Resetting SMC ...
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1answer
167 views

MacBook Pro stuck on GRUB minimal Bash at startup

I had a dual boot Linux Mint 19 and macOS on my MacBookPro11,2. Since the CPU was overheating with Linux, I decided today to delete the Linux partition. Little problem, when I start my MacBook Pro now,...
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1answer
121 views

Can you change an iPhone startup screen background from white to black?

It seems light-coloured iPhones have a white startup background colour with black Apple logo. As you can’t control the brightness on startup - this screen is offensively bright at night - searing your ...
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0answers
39 views

Cannot boot into any OS, Recovery or Safemode. (Macbook Pro 15 Ret Mid 2012)

My SSD was partitioned for Windows and macOS. I use the Macbook almost exclusively for Windows 10. Mid 2012 MBP Retina 15" 2.3Ghz 8GB. I recently began having problems booting into Windows. The ...
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1answer
74 views

After deleting kali linux partition, macOS partition startup Volume type FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF [duplicate]

First of all I know this problem and similar problems have been solved before, but I had tried the solutions from the other posts and I didn’t have luck. I know klanomath has a lot of experience and ...
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1answer
65 views

Bootable USB for Windows 7 isn’t showing up on MacBook Pro 12,2

I made a Windows 7 installation USB using Microsoft’s installation tool on my Windows PC. When I boot the Mac while holding Option. Only the Mac disk appears. The USB is NTFS. I checked if anything is ...
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1answer
64 views

(2010 Macbook on Sierra) White Screen of Death “Legacy Shim 2”

I am fairly confident this is not something that happens often, but I am open to be proven wrong. This is most likely a hardware issue, but I really hope it is not. My mac starts up with a blank ...
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0answers
34 views

2018 Mac Mini - Won't boot when power applied

I work in an environment where power is turned off to the building nightly. On previous revisions of the Mac Mini, I was able to get them to automatically boot when power is applied (in the mornings) ...
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1answer
423 views

macOS Mojave on iMac won't boot into safe mode

My iMac (late 2015, 8/1TBSSD) has run happily for more than a year on High Sierra, and I just now upgraded the OS to Mojave. Now, the machine won't boot into safe mode or into Recovery. When I hold ...
3
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2answers
156 views

MacBook Air not booting, Boot loader not available, Internet recovery not available

Recently I tried to factory reset my Mid 2012 MacBook Air. In order to do that: I booted into Recovery mode with Command + R. Then navigated to Disk utility and Erased Macintosh HD. Then I restarted ...
6
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2answers
702 views

Mac Pro install disk keeps ejecting itself

I am not that savvy with Macintosh computers so I can't figure out why the install disk keeps ejecting when I attempt to boot from disk by holding down the "C" button or the option button. It is not ...
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1answer
187 views

How to find out whether NVRAM was reset?

I was having some issues with my mac so I reset NVRAM by holding ⌘+⌥+P+R. The problem is that this laptop does not chime when NVRAM is reset, so I'm not sure if NVRAM was indeed reset. How can I ...
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1answer
146 views

13'' 2011 MacBook Air: Stuck at blank gray screen, no boot option working

I have a 13" 2011 MacBook Air A1369 stuck on a grey screen. When I startup I can hear the chime and the computer proceed to go to a blank gray screen immediately. The screen has no Apple logo or ...