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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786 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
39 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
49 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
114 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 ...
4
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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
43 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
78 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
67 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
64 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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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 ...
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0answers
51 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
47 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
103 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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2answers
1k 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 ...
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0answers
34 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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1answer
28 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
249 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
42 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
71 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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0answers
424 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
48 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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1answer
48 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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4answers
50k views

Macbook Pro stuck after I enter my password

For last 2 days I am not able to login to my MacBook Pro. It was working fine and suddenly for no reason after I last shutdown my mac I am not able to login. The mac starts up fine and goes to the ...
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0answers
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
90 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 ...
2
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1answer
193 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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0answers
19 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
455 views

iMac won't boot to internal drive, usb sticks - Apple hardware test extended fine

My iMac is being very odd. It won't boot using the internal hard drive. It chimes, starts the Yosemite progress bar and then changes and looks as if it is about to show me the login screen but then it ...
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5answers
20k views

How can I change the title of a boot image?

I have an external Hard Drive with two bootable partitions on it. The first is an image of a Mac OS X 10.6 Install DVD, and the second is an image of a Mac OS X 10.6.3 Install DVD. When I plug the ...
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1answer
77 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 ...
3
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1answer
199 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 ...
2
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1answer
1k 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 ...
2
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1answer
244 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
47 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 ...
3
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3answers
25k views

Need a bootable OS X installer iso

I removed the OS X partition off my HDD and installed Ubuntu. Now I want OS X back but I can't install it considering I have no access to Mac OS X. I need either an OS X Snow Leopard or OS X Lion .iso ...
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0answers
47 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
70 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
99 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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1answer
1k views

Broken MacBook boots grub

I had installed a Ubuntu partition on my Mac, but last night the keyboard broke, so I was trying to reinstall Mac OS from the recovery mode and accidentally wrongly deleted all the partitions my Mac ...
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0answers
35 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
588 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 ...
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4answers
2k views

2018 MacBook Pro won't let me install macOS High Sierra 10.13 from USB installer

I've got a 2018 MacBook Pro (Model ID : MacBook 15,1) that shipped with macOS Mojave 10.14, that I need to downgrade to run macOS High Sierra 10.13. I've tried reformatting the main drive using Disk ...
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2answers
754 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
203 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 ...
2
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2answers
2k views

macbook pro stuck in boot loop - recovery mode and safe mode not working

I have a macbook pro 2015 (8gb ram, running macOS mojave) stuck in the loading screen with the apple logo and the loading bar 100% completed. I tried leaving it for long periods of time. Resetting ...
1
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1answer
296 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 ...
0
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1answer
358 views

Early 2013 MBP Retina 15 won't boot unless Thunderbolt -> Ethernet dongle plugged in

My early 2013 Macbook Pro Retina 15" started to freeze a few days ago. The only way to get it (sort of) working was by holding the power button down and forcing a reboot. After a few days of ...
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1answer
40 views

How do I mount an SSD I got from an old Macbook?

I ripped a perfectly fine SSD out of a Macbook with a broken display. So far, all my attempts to access the file system on the SSD have failed. I've tried to put in a nearly identical Macbook. This ...
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1answer
40 views

MacBook Pro 8,2 (Early 2011, 15'' Unibody 2.3 GHz i7) - OS crashes randomly, after log in screen goes all white

I have a Macbook Pro, randomly started running into issues when logging in after start up. Occasionally will get the desktop to load but shortly thereafter the OS crashes leading to a screen with ...