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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35 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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2answers
65 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 ...
3
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1answer
60 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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0answers
33 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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4answers
12k views

Single-User-Recovery-Mode on High Sierra 10.13.6

Before the High Sierra update to 10.13.6 I was able to boot in single-user-recovery mode by holding Cmd-R-S at startup, but after the latest software update booting while holding Cmd-R-S just enters ...
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8answers
425k views

How do I create a Mac bootable USB drive using Windows?

My MBA 2012 with OS X 10.9.4 Mavericks won't boot anymore - it simply freezes after the initial jingle. I already tried resetting NVRAM and SMC, but to no avail. I don't have any time machine backups. ...
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1answer
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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0answers
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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1answer
4k views

How to check if a Firmware Password is enabled in OS X?

I do not know how to check if Firmware Password which prevents changing the OS Startup Disk options is enabled on my Macbook Air 2013-mid with El Capitan 10.11.4. How to check if Firmware Password ...
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1answer
53 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 ...
3
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2answers
154 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 ...
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0answers
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
58 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
382 views

Black screen with cursor & black touchbar

I have rebooted by MacBook Pro 2018 (with macOS Mojave installed). Everything went well: I was prompted for my account password and then the system started loading. Here start the bad things: control ...
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1answer
24 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 ...
2
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4answers
12k views

OSX Prohibited symbol on Boot (High Sierra Update Caused)

ive been researching and fighting this for a couple days now. I tried recovery boot, disk utility, repair etc.. nothing seems to fix this... heres what happened.. this 'puter was just fine, nothing ...
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3answers
64 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 ...
6
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4answers
39k views

Mac won't boot from USB drive: Prohibited sign

I tried to clean install OS X El Capitan on my Mac, but it won’t boot from the USB drive. Here are the steps I took to create the bootable USB drive (I have a Mid-2014 MacBook Pro with Retina Display):...
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1answer
566 views

Resetting screen brightness setting in touchbar MacBook Pro during boot

Due to a series of unfortunate events, my 2018 15” MacBook Pro found itself out of battery and with screen brightness set to zero. I should also mention that I have FileVault full disk encryption ...
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2answers
1k views

iMac loading bar gets stuck halfway then reboots

OSX 10.11.5 iMac turns on fine but loading bar gets to just over 50% and then a horizontal bar across the screen shows, then the screen goes black then to white. It stays at white then iMac turns ...
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2answers
9k views

Windows support software could not be saved to selected drive, Error Installing Win 10 on MBP2017. I Already did SVC, MVRAM reset

I have already did SMC and NVRAM Reset, and also using first aid on my single partition drive. Still doesn't work. First, before I was used first aid, and did NVRAM- SMC reset. The title is "Disk ...
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0answers
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%, ...
6
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1answer
37k views

How to install Windows 10 into a 2011 iMac without using the Boot Camp Assistant, an optical (DVD) drive or third party tools?

Apple does not support Boot Camp Assistant installations of Windows 10 on 2011 and earlier iMac models. The exact list of supported Mac models is given below. The following Mac models support 64-bit ...
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2answers
1k views

How can I create a bootable windows 10 usb installer on Mojave?

Boot Camp Assistant no longer allows to do this dd shouldn't be used for bootable sticks (see here) Using unetbootbin I can only write on FAT32 formatted USB, but that does not work (see here) How ...
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0answers
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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3answers
769 views

2008/9 Mac Pro wont turn on, front pannel LED is constant white

My mac pro doesn't want to start up. I purchased some new memory installed it (and cleaned up some of the dust on the inside of the box) and now the machine won't boot up. I get a constant white ...
3
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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
36 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 ...
2
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1answer
100 views

Adding functionality to macOS pre-boot process

Is anyone familiar with adding functionality to the macOS pre-boot process? I'm trying to supplement FileVault's functionality so that it can integrate with a user directory service, which isn't ...
3
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2answers
1k views

On lid open Macbook Pro 2016 boots automatically - after turning off I need to juggle 10 seconds with the touch id power button to boot

I have the late 2015 (15 inch) MacBook Pro. By default it turns on when laptop lid is open. This is not good for me, sometimes I open the lid on weak battery to make sure it's not turned on, so I ...
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0answers
30 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
54 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
29 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'...
2
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4answers
3k views

Duet Display install caused reboot to hang on High Sierra

I tried to install the app 'Duet Display' today. It was always troublesome on my Windows PC, so I was disappointed to see it wasn't working very well on my new MBP 2017 13" w/ TB as well. The ...
2
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0answers
33 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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0answers
62 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 ...
3
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2answers
925 views

tmutil - Failed to delete local snapshot

My mbp is stuck on boot and fsck cannot be performed because of: snap_metadata_val object (oid <aléatoire>): invalid extentref_tree_oid (0x0) It happens that I have dataless snapshot and if I ...
0
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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 ...
0
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1answer
26 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
230 views

MBP refusing to boot from fileVault encrypted SSD after motherboard replacement

Changed the motherboard/logic board of a MBP 13" 2014 model. After the operation it just shows a blinking question mark when starting. I can however boot it from a High Sierra USB drive and when it ...
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0answers
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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0answers
39 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 ...
2
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0answers
400 views

OSX stuck on boot after switching language

since yesterday my MacBook is stuck on boot after changing language in the systems control panel: Before the login I just see a circular loading indicator and my mouse cursor is stuck in the top left ...
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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 ...