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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Macbook Pro Booting Issue

I have a Macbook Pro 15" Retina Mid 2014. Off late, whenever i put my mac to sleep and when i try to wake it up, it doesnt! I need restart it, but then it takes lot of time and just hangs at the end ...
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Mac Freezes on Launch

Mac running 10.14.5 is freezing after the login screen each time I reboot. Seeing these stange messages in /var/log/system.log that seems suspect. com.apple.xpc.launchd[1] (com.apple.CloudDocs....
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Macbook Pro a1278 fails to boot [closed]

i have a personal Macbook Pro a1278 that fails to boot. I made the choice to contact an Apple service who changed the SSD and my antivirus failed to start not having the right permissions. I did not ...
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Overdrive the fans but fails to boot [closed]

Hello for about 3 weeks i have a problem with a virus. I did contact an apple service and after changing the SSD the problem still persist. For the Macbook pro a1278 i have, i need to find the BIOS ...
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Recovery Mode can't see new drive but USB installer can

I'm having a lot of difficulty replacing a dead SSD in a 2013 macbook pro. Before the drive died the computer was running a fairly old version of OS X, seemingly Yosemite. I bought an OEM ...
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How to setup properly Clover EFI?

I need a little help to how to setup Clover Bootloader - to handle a dual-boot on a late 2008 unibody Mac(Intel dual-core 2GHz, 4GB). This Mac is already containing two partitions - see below - but ...
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1answer
15 views

Can't access Recovery Mode (2011 Mac Mini)

I was gifted a 2011 Mac Mini and I decided to try and get the thing up and running with a recent enough version of MacOS. When I turned the thing on, I was greeted with a fast boot to grub, indicating ...
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1answer
20 views

Reinstall macOS on Ubuntu MBP

After an update broke my 2015 MBP, I installed Ubuntu 18.04 on it (via USB). Now I want to go back to MacOS. When I boot into recovery mode (cmd+optn+R), I reach the usual menu of options. When I ...
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1answer
23 views

MacBook Pro (2011) shows flashing folder at startup but the disk is valid

I have a MacBook Pro (early 2011) and recently the laptop boots to a white screen that flashes a folder with a question mark. I know that means the laptop cannot detect an available startup disk. I ...
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How do I install El Capitan and ParrotSec dual-boot? (without Kernel Panics)

ParrotSec was installed on this machine and it was running fine - meanwhile I could not reach it from Grub2 because if I chose MacOSX-32bit/MacOSX-64bit it popped back a Kernel Panic. On the other ...
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MacBook Pro late 2013 (Model: A1502) won't boot or respond to any Input

I have a big problem with my MacBook Pro late 2013 it does not boot or light up in any way. Current behavior The only reaction that I get is, when I connect it to the powercord and start with the ...
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1answer
18 views

Macbook stuck at login screen

My macbook is stuck on the login screen after entering the password. I've been using this MBP for the past 4 years and it's been slowing down of late. However, I'm now having trouble logging in to my ...
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MBA 2017 won't boot up in macOS, but will in Ubuntu

A few days ago my spouse's MBA started showing problems. At first it wouldn't turn on at all, showing an orange indicator on the MagSafe charger. After resetting the SMC a couple times and letting it ...
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Getting the “prohibitory” symbol on startup

I have a mid-2004 PowerMac G5 that until recently was running fine. It had OS-X 10.3.5 installed. At one point the screen froze, no mouse, no keyboard. I powered it down and back up again. That's ...
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3answers
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MacBook Pro 15" 2008 freezes with colorful screen

Starting a few days ago my Mac froze mid usage, was using Chrome when it did it. I got all these crazy colors everywhere, and it froze. I turned off the power, waited a few, then turned back on. It ...
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1answer
21 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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60 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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18 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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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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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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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
76 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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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
387 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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193 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
42 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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27 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
88 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
30 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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30 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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22 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
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 ...
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44 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
81 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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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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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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104 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
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
110 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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45 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
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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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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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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0answers
35 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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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 ...