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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votes
1answer
270 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
votes
1answer
936 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 ...
5
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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
votes
1answer
70 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....
5
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3answers
2k 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
votes
2answers
109k views

Can't restore or update IPhone - TATSU declined to authorize

I'm attempting to either restore or update an iPhone 5 which won't boot. It's stuck on the apple logo boot screen. Hard reset does nothing. I have tried normal restore mode via iTunes and DFU mode. ...
5
votes
3answers
35k 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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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
votes
1answer
203 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 ...
5
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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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2answers
23k 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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7answers
290k views

Why would my iPhone 6 be stuck in a dead battery boot loop?

Okay, so I have a problem. My iPhone 6 died (it runs a non-jailbroken version of iOS, I used it as a test device for development applications, but I didn't do anything crazy with the firmware of the ...
4
votes
1answer
26k 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 ...
4
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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
votes
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. ...
4
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3answers
338 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
698 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?
4
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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
votes
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
votes
1answer
1k 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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3answers
2k 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
19k 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
votes
3answers
2k views

iPhone 6 Boot loop and Error 9

I have a problem with my iPhone 6. My iPhone 6 bootloops similar to this question: Why would my iPhone 6 be stuck in a dead battery loop? However, the answers there do not help. In addition, when I ...
4
votes
2answers
13k 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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4answers
26k views

Thin green lines on boot, then screen goes grey (late 2011 MBP – 8,2)?

Last night I was using my late 2011 MBP (higher res screen, dual Intel/AMD graphics), and the screen suddenly went black. I left it go for a minute - no change. I open and closed the lid – it ...
4
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3answers
57 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
votes
1answer
16k views

Can't start Mac in recovery mode - only get folder with question mark instead

I can't start my MacBook Pro 2017 using controlR, controloptionR, or shiftcontroloptionR. For all combinations I only get the folder with a question mark shown. What can it mean and how can I fix ...
4
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3answers
9k 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
votes
1answer
568 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 ...
4
votes
1answer
9k views

How to use Boot Camp Assistant to create a dual OS X, Ubuntu system?

I would like to use Boot Camp Assistant to partition my HD, reserving around 30 GB for Ubuntu. I would then have a dual OS X Yosemite and Ubuntu Linux system. This used to be fairly easy. Boot Camp ...
4
votes
4answers
317 views

Mac Won't Boot. Help needed

I use top-notch MBPRO15 Late 2011 with the latest OSX and all the recent updates installed. I had booting problems before which I managed to solve through command+option+P+R. I'm not sure what exactly ...
4
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2answers
3k views

Add Static ARP Entry at Boot

I'm new to Mac OS X. On Linux I'd: append to /etc/rc.local arp -i eth0 -s 192.168.1.1 00:00:00:00:00:00 I've figured out how to do it in Terminal: sudo arp -s 192.168.1.1 00:00:00:00:00:00 But I'd ...
4
votes
1answer
14k views

How to create USB Ubuntu boot disk in OS X so that it boots on *non-Apple* computer?

While this seems like a straight forward task, the few methods I've tried so far don't create a USB device that my Dell computer will recognize as a valid bootable USB drive. Here's what I've tried ...
4
votes
1answer
7k views

Can I boot Linux (any distro?) from USB on a MacBook Air that has no hard drive?

I've a MacBook Air that has burned out three hard drives from OWC. The original drive is gone somewhere, and it no longer makes sense to purchase a replacement. The rest of the hardware is in good ...
4
votes
1answer
10k views

How do I change the default boot option on rEFIt?

I have two copies of OS X (10.6 and 10.7). By default rEFIt boots 10.6. However, I want to make it boot 10.7 instead. How do I do this?
4
votes
1answer
3k views

How do I boot into the EFI firmware shell?

I'd like to experiment with the EFI shell on a MacBook Pro 2010 model. I am unable to find the keyboard sequence to hold on boot. Does someone know what the sequence is, do I need to boot from my ...
4
votes
1answer
2k views

How to stop mac from default booting in deleted windows via boot camp?

I bountied this question Boot into Mac from Windows after failed Bootcamp after being trapped in Windows hell on my mac, after the first time using boot camp. When I got back to my mac I erased ...
4
votes
2answers
823 views

How do I find the Apple startup chime/sounds on my computer?

How do I find the Apple startup chime/sounds on my computer? I know there has to be someway for it to be stored, but I'd just like to be able to access the file/raw binary...
4
votes
1answer
3k views

Is there a faster way to restart macOS Sierra into the bootcamp partition? [duplicate]

When I'm in windows under bootcamp all I need to do to restart into macOS is Right click the bootcamp icon in the task bar Select "reboot into macOS" When I'm in macOS and I want to switch to ...
4
votes
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 ...
4
votes
2answers
2k views

MacBook Pro 2011 shows grey screen during boot

My early 2011 MBP stopped booting up. It now shows only a grey screen after about 1/3 of the boot up process. I tried Verbose mode, where the last lines visible before the grey screen can be seen in ...
4
votes
1answer
3k views

How to boot Linux from Mac using rEFInd

I have successfully installed rEFInd on my MacBook Pro 2015 so I can boot into Linux however I cannot seem to boot into it. Here are my issues (both with Ubuntu 64x Mac CD and Kali Linux 64x USB). ...
4
votes
1answer
2k views

Trapped: MacBook always shuts down during EFI SMC Update 1.8. Can't boot. How to remove updater from boot routine?

MacBook Pro i7 Mid-2012 (MacBookPro9,2) running Mac OS X 10.8.5: Downloaded the "offered" EFI SMC Update 1.8 through the AppStore Updates. MacBook restarted, grey progress bar appears w/ spinning ...
4
votes
1answer
3k views

How do I prevent automatic mounting of all the partitions on a flash drive?

I have a flash drive that I use for various diagnostics on macs. Most of the partitions on the drive are accessible by holding down the option key on boot. I also have one extra partition that is not ...
4
votes
2answers
7k views

Is the first boot after a full system restore from TimeMachine supposed to take a long time?

I have had the hard drive in my iMac replaced and now I'm trying to restore it from my TimeMachine back up. I thought the TimeMachine back up was corrupt but maybe I'm just not patient enough, or I'm ...
4
votes
1answer
41 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 ...
4
votes
1answer
430 views

macOS 10.12: MacBook Pro Retina takes hours (literally) to boot

I've got a mid-2012 15" MacBook Pro Retina (MacBook10,1 - i7-361QM - 8GB RAM) running Sierra 10.12.6 (16G1036) that can take, literally, several hours to boot. I am not able to boot into recovery or ...
4
votes
3answers
13k 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: ...
4
votes
2answers
559 views

Mac boot menu not showing up with different keyboards

I have a Macbook White from 2010. I have been using it for a while and everything works except the internal keyboard which is broken because of a tea spill. An external PC-keyboard (USB) is attached ...