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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1answer
16k views

Recover Bootcamp EFI Folder/fix boot entries?

I had macOS and Windows 10 installed through Bootcamp on my Macbook Pro (late 2013) and everything worked fine. Then I tried installing Ubuntu on an external drive and setting up pure-EFI triple boot. ...
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5answers
13k views

How can I get my 3rd party SSD to boot El Capitan?

I have a Mid 2012 13 inch MacBook Pro that's been running successfully with a hybrid drive (3rd party) for the last few years. Recently, the operating system crashed and the hard drive is no longer ...
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5answers
16k views

What causes 5 pink bars on 27" iMac (2011)?

I've got a 27 inch iMac made in 2011 that displays 5 pink vertical bars on the screen. It won't boot properly. I ran the Apple Hardware Test and it came up clean. Machine Specs: Apple Subfamily: ...
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1answer
2k views

How can I tell OSX NOT to mount some of the drives in my computer?

I have a Mac with a Windows drive that I occasionally boot to. Most of the time, I'm using the Mac, and the Windows disk always mounts and shows up on the desktop. I would like to keep it from showing ...
5
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3answers
11k views

Macbook Pro (late 2011 15") is stuck in a boot loop

It boots up until the progress bar is at about 80%, then it flashes to an empty grey screen, no login window shown, no Apple logo. 30 seconds later it reboots on its own. Things I tried: reset the ...
5
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3answers
11k views

How to boot and install Linux or BSD on a 2007 MacBook White via USB?

I have an old MacBook white (Model 2,1 mid-late 2007) which won't upgrade beyond Snow Leopard (OS X 10.6). I have previously installed Debian with a dual boot by using rEFIt and booting from a DVD ...
5
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1answer
5k views

Can't boot, fsck -ya in single user says 'Disk full'

My Macbook Pro suddenly turned itself off (I believe I got a popup saying it was soon out of diskspace, but I didn't think this meant "Your OSX installation will soon be unusable"). After this, I ...
5
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3answers
37k views

How do I install rEFInd on a MacBook running macOS Sierra?

I've disabled SIP and tried to install rEFInd on my MacBook, which is not partitioned in any way by boot camp and is one single drive. The install of rEFInd says it is installing to /Volumes/ESP for ...
5
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2answers
26k views

Panic on boot, need to use single user mode (was: need to rebuild kext cache)

I'm getting this at every boot on one Mac: With some searching and asking around I've found that I can get a successful boot if I boot into single-user mode, mount / as read/write, and then do touch ...
5
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2answers
7k views

Resetting MBR on iMac

I installed Ubuntu on my iMac (partially successfully) I had rEFIT installed but it did not recognize the Ubuntu installation. I removed the partition and rEFIT and now when I attempt to install ...
5
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2answers
11k views

Macbook Pro hangs when booting into Boot Camp Windows 7

I have a 2011 Macbook Pro 15" 10.7.4 with Windows 7 installed in Boot Camp. A few days ago, I tried to boot into Windows 7 and it just froze after I selected the Boot Camp volume on the Select Drive ...
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3answers
4k views

How to create a bootable USB drive for Disk Utility?

Disk Utility says my boot drive need repair. Unfortunately my DVD drive is toast, so I can't boot from the install DVD and make the repair. Is there a way I can create a bootable USB drive and ...
5
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2answers
157 views

Where are the MacOS startup boot icons located?

Where is the exact location of certain icons like the internal storage drive icon you often see in the startup boot manager and other boot icons like it located on MacOS? MacOS Catalina 10.15.2
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2answers
223 views

Is 2017 MacBook Air SSD compatible with mid 2013 MacBook Air 11"?

I need to change the SSD of my MacBook Air 11" mid 2013 and I was wondering if the one of a newer MacBook Air 2017 would be compatible. I researched online and I think that the ports remain the same (...
5
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1answer
345 views

iPhone 7 Plus takes days to turn on showing Apple logo or black screen

I’ve had this issue for months but in the last couple of days it’s got very very bad. When my phone runs out of battery it needs like 2–3 days to turn back on. At the beginning of this problem the ...
5
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1answer
1k views

Fix boot loop of macOS updater

The latest macOS 10.13.2 update apparently didn't install well on my MacBook Pro 13" with Touchbar. On every boot the system loads the update installer but gives then an error message that the ...
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2answers
2k views

Macbook Update to High Sierra unbootable

I updated my late-2013 MacBook Pro from macOS Sierra to macOS High Sierra this morning. The update ran fine and I got back into my system everything looking ok. Then I shut the MacBook down to go to ...
5
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1answer
72 views

Update to macOS 10.12, but still keeping 10.11 in an external HD

I am still running macOS 10.11, now I wanna update to 10.12, but since some apps must be running on 10.11, so I need to keep this system and here is my plan: I use TimeMachine to backup my system 10....
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3answers
3k views

macOS Startup Manager is very slow and laggy

I have a MacBook Pro (Retina, 13-inch, Early 2015) on the latest version of macOS Sierra (10.12.3 at the time of writing). Whenever I hold the Option key after turning on my Mac, it takes a long time (...
5
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1answer
3k views

How to repair bootcamp after partitioning for triple boot

I already had El Capitan and Windows running smoothly. I needed to add a partition so I could triple boot into Ubuntu. OS X and Ubuntu both work perfectly now but my Boot Camp side seems to have ...
5
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1answer
226 views

Possible reasons (other than Open Firmware Password Protection) for not being able to boot into single user mode?

Recently I was attempting to install some new software for a user. I followed these instructions to create a new admin-level account but when I held down cmd+S while booting it still booted into the ...
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1answer
4k views

Installing Windows manually

Here's the situation: I've got three partitions on my disk - EFI, OS, and a Data Partition + 40 gigs of free space for a Windows partition. I already deleted the Recovery partition to avoid conflicts ...
4
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3answers
24k views

disk full - Mac OS won't boot

My friend has a problem getting Snow Leopard to run because the disk is completely full. I suggested getting into command line mode (CMD+S on boot) and delete some things, but it didn't work (nothing ...
4
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1answer
13k views

How to examine disks and their partitions via terminal?

I am trying to examine my settings to prepare for a triple boot and would like to know how to completely examine my HDD before to make sure I know everything usefull for the project to know about it.
4
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1answer
2k views

How can I enter recovery mode (for Mac OS, on an iMac) remotely?

Our team administrates several Macs. To save costs (flights, etc.) in events where we have to remotely restore a system at our client location, we are trying to understand how to enter recovery mode ...
4
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3answers
273 views

How do I prep a, temporary, root login before editing sudoers?

I want to alter my sudo capabilities on my mac, to avoid password prompts on starting postgres among other things. I'm reading Michael Lucas' Sudo Mastery and generally have an OK idea on how to ...
4
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4answers
68k views

MacBook Pro refuses to boot/recover, hangs at “white screen”

I am somewhat new to caring for Macs, but one has been left in my care and I have not been able to restore it to working order yet. Here are the symptoms: The MacBook Pro would hang with a "white ...
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1answer
27k views

What does boot.efi actually do?

I understand that when a Mac's EFI system runs, it locates the file boot.efi in the /System/Library/CoreServices/ (blessed) directory and runs this as an EFI application (subverting a large part of ...
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4answers
4k views

Why does RAID 1 “Mirroring not provide performance improvements”?

I have always used Software RAIDs, either Apple-provided, or via SoftRAID, etc. I am about to re-zhuzh my arrays and decided to do a little research beforehand… and On Apple's site, there is a ...
4
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1answer
5k views

Boot MacBook Pro into non OS X operating system from external harddisk

I have a MacBook Pro and an external HDD with Ubuntu, I can use this HDD to boot other machines into Ubuntu but no amount of pressing option would make my MacBook Pro think that the drive is bootable. ...
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2answers
3k views

macOS Catalina: execute bash script on boot with launchctl

Before updating to Catalina (10.15.1) my agent based on a bash script was working perfectly. I had set the agent in order to execute the bash script on boot. Here is the plist file: <?xml ...
4
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1answer
755 views

I can no longer boot into macOS after resizing my bootcamp partition in EaseUS

I tried to enlarge the bootcamp windows 10 partition by 17gb. I went to disk utility on my mac, resized the mac's partition to smaller leaving 17-18gb of free space, then booted up the windows in ...
4
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3answers
599 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?
4
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1answer
1k views

Replacing macOS with elementary OS. Computer boots normally into elementary OS, but boot menu (option key on boot) doesn't show anything

I want to replace macOS with elementary OS on a Mac. I formated the entire hard disk, inserted the elementary OS bootable USB, selected EFI boot on the boot loader (only option) and installed ...
4
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1answer
2k views

Where does the OS X routing table come from?

Trying to find out where the initial routing configuration for OS X is stored (plist, or wherever), and what happens at startup to read that configuration and configure the network interface(s).
4
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1answer
713 views

Wake on LAN for MBP late 2009

Is it possible to wake my MBP via Magic Packets from power down? I read Is there a way to power up a Mac Mini remotely?, but that does not seem to work from power down. "Wake for network access" in "...
4
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2answers
3k views

Install and boot Windows from USB hard drive?

I would like to install Windows 7 on an external USB 2.0 500 gb hard drive. Is it possible to both install to and boot from this USB drive from my MacBook Pro 2010?
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3answers
16k views

What does no chime on boot mean?

My MacBook Pro is having some issues. It boots. But the graphics card doesn't get detected. You can remote in to it but looking at the Displays dialog in System Preferences, no graphics card is shown: ...
4
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2answers
234 views

Earliest way to disable wifi at login or boot

I'm running Catalina, and the OS will always turn wifi on at boot. I've been looking into methods to turn wifi power off when I login, and I've created a .plist: <?xml version="1.0" encoding="UTF-...
4
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1answer
2k views

Can't boot Macbook Pro 2018 (possibly Little Snitch/Mojave related)

I have a Macbook Pro 2018 15" running Mojave (latest update). After updating to the latest Little Snitch and restarting my machine it now fails to boot. I boot up and can enter my password (I'm ...
4
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11answers
6k views

OSX Boot drive selection screen is slow, un-responsive and takes forever to load in Macbook Pro (early 2015)

I have a Macbook Pro Retina 13" (Early 2015) and I have a bootcamp partition with Windows 10 installed in it. Also, there is an Ubuntu Linux on another partition, so it’s a triple boot computer. I’m ...
4
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3answers
3k views

How do I set my mac to ask what disc I want to boot from without having to hold alt?

I can switch between OSX, Windows and a network drive, but I cannot seem to find this option anywhere.
4
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5answers
20k views

MacBook Air has suddenly become very slow at booting and shutdown

I have a Late 2010 MacBook Air, and it has a 256 GB SSD, 2.13 GHz processor, and 4 GB RAM. It has been lightning fast ever since I bought it and I upgraded to OS X Lion and it was super fast. Boot ...
4
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2answers
133 views

Snow Leopard Clean Install

I have an iMac from 2010 and the Snow Leopard DVD and I am trying to do a clean install of Snow Leopard on it. Then, if I use the Install Snow Leopard option from the DVD, when it restarts it hangs on ...
4
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3answers
10k views

High Sierra won't install: for the boot disk it says: “This disk cannot be used to start your computer”

I have a macbook pro late 2012, single stock SSD, Sierra installed with latest updates. I am trying to install High Sierra. When I go to select the disk to install on (the current, normal boot ...
4
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2answers
4k views

Funny Apple Logo colors during startup

When my iMac boots up the apple logo and progress bar flicker red very briefly. There doesn't seem to be anything else the matter with the computer apart from this. It's a very new retina iMac running ...
4
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2answers
18k views

Can I disable wifi on boot? System not booting

That is, are there nvram boot-args to disable wifi or a startup key sequence that does? Safe mode is said to PARTIALLY disable Wi-Fi on some Macs. I googled and couldn't find an answer. Haven't ...
4
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3answers
153 views

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 ...
4
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2answers
2k 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 ...
4
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1answer
749 views

Mac multiboot flash drive

I am in the process of creating a multiboot drive with OS X starting from 10.7 up to 10.12 (Lion, Mountain Lion, Mavericks, Yosemite, El Capitan and Sierra). I have bought Kingston DT micro 3.1 64GB ...

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