Questions about booting, the process of starting a computer and putting it into a state of readiness for operation.

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33 views

OSX error message on boot, can anyone tell me what might be wrong?

My friend asked me if I can help fix his computer, I am a Linux user exclusively, therefore I'm not well-versed in proprietary systems like OSX. I'd be eternally grateful if you guys could take a ...
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2answers
56 views

MacBook Pro not booting from hard drive

I got a MacBook Pro that has a problem booting, or even seeing the hard drive. I have used the recovery console to install OS X onto a USB drive and have booted into that and can't actually see the ...
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2answers
153 views

EFI Boot Frozen When Trying to Install Windows 8.1

I am trying to install Windows 8.1 in Bootcamp on my Mac Pro Early 2009 Edition which should be possible according to this page: https://support.apple.com/en-ap/HT201457 I went through all of the ...
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2answers
78 views

Recovering OS X partition: wrong boundaries calculated, can't mount disk0s2

I followed the strategy of Klanomath (see link) in order to recover my lost OSX (el Capitan) partition (MBR overwritten by bootcamp Windows). In this procedure you have to find the right boundaries of ...
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1answer
314 views

fsck -fy hangs on Checking catalog file + issues booting (MacBook)

Last night my MacBook Pro crashed. This morning I tried turning the computer on, and it had a few issues.. Computer doesn't get past initial boot up loading. Fan activates loudly while starting up. ...
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35 views

iMac won't boot. No keyboard recognition

I know that there are a lot of people that ask for help when their iMacs won't boot, but in all sites they tell you to use keyboard commands to reset NVRAM or something like that. This case is ...
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0answers
71 views

Fusion drive suddenly not bootable: “Too few free segments”, made read-only

I've dealt with a lot of disk issues over the years admining lots of different OSs, but this one is new to me... help/ideas appreciated before I give up and restore! Woke up this morning to my iMac ...
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1answer
210 views

MacBook Pro fuzzy screen and freezes on startup at the Apple logo with half progress bar

Details: MacBook Pro 2011, El Capitan. Issue: As mentioned above in the subject. Picture Given below. Resolutions tried so far: PRAM Reset - Heard the Chime of reboot but still hangs the same way ...
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1answer
255 views

Mac won't boot; get the Apple logo then it becomes a prohibitory symbol

I start up my early 2011 MacBook Pro, and it gives me the login screen, I enter my password, and then booting starts as normal, but about halfway through the progress bar, it stops booting entirely ...
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0answers
13 views

Macbook Pro Early 2011 Filesystem Corruption, Weird SATA GPT Boot Issue

For the past couple of days, I'm experiencing filesystem corruption and a really weird switch of my SATA drive numbering on an early 2011 Macbook Pro (8,2). So I've got Linux, Lion, and Bootcamp ...
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1answer
63 views

Mac Pro stuck on white loading screen

I have Mac Pro which is running 10.8.5 After I turn on the Mac, I can see the regular apple logo, but after it's disappear, I see white screen (whiter than before) and a loading wheel for a few ...
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1answer
30 views

10.11: Good Samaritan message not showing on Filevault2 unlock screen

You can set up a lock Message under System Preferences => Security & Privacy => General => Set Lock Message. This Message is stored in NVRAM. Under 10.9 Mavericks it was not only shown on ...
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1answer
49 views

Booting gets stuck for a minute when using Bootcamp on Windows 10

I installed Windows 10 using the official ISO and one of the serials I have with MSDN. When I reboot my Macbook Air 2013 it gets stuck on a black screen for around a minute and then start loading ...
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1answer
83 views

Macbook 15" showing green distorted logo and wont start

I have macbook pro 15" (late 2011). Its showing a distorted green logo and loading bar on starting. Its taking around 10 min then showing just white screen. I tried resetting pram, but its still the ...
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0answers
48 views

Having trouble making bootable El Capitan installer on early 2013 MBP that works on mid 2012 MBP

My friend bricked his mid-2012 (non-Retina) Macbook Pro (I'm not sure right now which clock speed he has). I have an early 2013 Retina Macbook Pro. Using my computer, I made a bootable external USB ...
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0answers
165 views

Creating a bootable Windows USB drive when Bootcamp is already installed

I just upgraded to El Capitan, and am now having issues booting directly into Windows. I need a bootable Windows USB stick to repair my bootcamp partition, but I'm having a difficult time making that ...
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1answer
28 views

Multi-colored lines only on screen when booting 17" iMac Core Duo 1.83Ghz

New to StackExchange/Ask Different. Been a lurker for a long time, this is my first question/discussion. I hope somebody might point me in the right direction. I was recently given a couple old ...
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1answer
38 views

MacBookPro8,2 early 2011 boots into safe mode but not to recovery mode (even with USB)

I have a MacBook Pro early 2011 that will only boot into safe mode, trying anything besides single user results in a crash or hangs with a white screen, can't even boot from an El Capitan USB, current ...
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0answers
34 views

Does my stuck shift key affect the proper boot of my installation mediums?

I have a late-2009 unibody Macbook Pro. My left shift is stuck for ages and I have been avoiding this problem by pressing some other keys during boot to avoid safe mode and by using Karabiner to remap ...
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0answers
45 views

Bootable SD Card doesn't appear at Startup Manager

I have a bootable SD Card with Windows 10 installed, and it works fine in the most of macbook pro I have tested, but there is one in which when I press alt / option key, the SD Card doesn't appears ...
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5answers
465 views

Error Installing OS X El Capitan on Early 2008 Mac Pro from USB

I am trying to install OS X El Capitan on an early 2008 Mac Pro. I wiped the hard drive on the Mac and followed this tutorial to create a USB boot drive with El Capitan using a Macbook Air running El ...
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2answers
666 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 ...
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0answers
24 views

Booting from SD card freezes Macbook

I followed the instructions found here: http://docs.kali.org/downloading/kali-linux-live-usb-install#osx for installing Kali onto a 4 GB SD card. I got output from the terminal similar to that in the ...
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1answer
51 views

MacBook Pro won't boot. Ideas?

MacBook Pro won't boot. Getting various grey screens. When try to do straight boot, get flashing folder. Other things not working: OS X recovery, start up manager, single user mode, verbose mode, ...
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0answers
51 views

Way too many disks in rEFInd?

I'm using rEFInd on my mac that is installed on its own partition. Everything works fine except when I boot into rEFInd (the "EFI Boot" option under the disk selection menu on startup) it shows my OS ...
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1answer
174 views

16GB RAM 1067 DDR3 not Booting on MacbookPro7,1 (13 in Mid 2010)

I have a mid 2010 13in MacBook Pro (7,1) with a 2.4GHz Intel Core 2 Duo processor running OS X 10.11.3 (El Capitan). I had 4GB of RAM (2x2GB) and I read somewhere that despite Apple's stated max of ...
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1answer
110 views

Boot Camp flash drive not showing on boot for late 2009 iMac

I already installed Windows 10, using the Boot Camp Assistant, on my MBPr (late 2013) without any problem. However, it is a "new" model, everything went fine. But, now I am trying on an iMac (late ...
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1answer
2k views

Unable to boot into recovery mode on El Capitan MacBook Air

I want to disable System Integrity Protection, So i am trying to run this command csrutil disable On recovery mode, But i am not able to boot in Recovery mode, It keep showing user login screen, I ...
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0answers
62 views

Gray screen of death when booting

I know this has been brought up many times before here, and I know there has been many answers and suggestions to this problem, but so far nothing seems to be helping me in my situation, so I thought ...
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1answer
109 views

Is it possible to encrypt the boot disk in El Capitan?

On my iMac running OS X 10.11.3 I'd like to encrypt as much as possible of the built-in disk -- like that I don't need to worry about replacing/sending in a broken disk. From a casual few web ...
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2answers
343 views

MacBook Pro wont boot at all (El capitan)

My MacBook Pro stopped working. I was using it without a problem, then all of a sudden the screen went Blue. It didn't respond at all so I did the obvious, force shutdown. Since that moment the ...
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2answers
27 views

Make Mac boot upon plugging in power

I have a MacBook and I'd like it to boot automatically upon plugging it into a power source. Is there a way to do this?
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1answer
152 views

Ghost partition, Windows BSOD

Today I was trying to set up Windows on my MacBook Pro (15", Late 2011) over BootCamp. I used the modified Info.plist-trick to create a bootable Windows 8 USB-drive and create a Bootcamp partition. ...
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0answers
34 views

Debugging verbose boot mode

My issue is that a MacBook Pro (mid-2012) started to have problems booting up today so I'm trying to debug the boot process by running it in verbose mode. The problem is I can barely read what it ...
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1answer
105 views

Cannot access Boot Camp partition after OS X reinstall

I've already used Boot Camp to install Windows on my computer. A while back I had to erase my hard drive and reinstall Mavericks. Once I did that my Windows portion still exist as a volume, but when I ...
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1answer
34 views

Can I boot my recovered SSD as a Mac OS X installation

I recovered an SSD from an old, upgraded 2008 Macbook Pro with a broken keyboard in order to recover the data from it. Initially I was planning to put it in my other Mac Pro and simply copy the data ...
0
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1answer
62 views

My iMac Doesn't boot it. Hangs with spinner and verbose mode can't boot

I have my iMac and I have to install Yosemite because I got iMac with older version when I got it. Then I did too many updates but I had my iTunes account and I had my credit card option set to "None" ...
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0answers
101 views

iMac will not boot up with built-in LCD connected, but will boot without it

When I press the power button on my iMac (Early 2008 24" A1225 EMC2211 MB325LL/A) it begins to start up, but halfway through the start chime it loses all power and needs to be unplugged before the ...
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0answers
62 views

Gray screen when booting mac on external monitor

I've run into a problem while booting my MacBookPro (from 2014). When I restart the computer without any monitor attached, I hear the chime, but the screen on my laptop screen stays black. I usually ...
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0answers
24 views

Install Windows to portable hard drive?

I'm trying to install windows on a portable 1tb hard drive and boot it via boot camp on the same hard drive. Want to know if this is possible? My main motivation is due to my school having mac pros ...
0
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1answer
82 views

SNB Framebuffer did not show up,unload - MBP won't boot

I recently got a new MBP. My older MBP (early 2011, 13") has some stuff on it I would like to transfer. I tried using migration assistant, but it appears that they need the same OS versions. I tried ...
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0answers
28 views

MacPro 2.1 won't boot from USB nor from MacBook via target mode

My Mac Pro 2.1 (I believe 2x 2.33 quad / 32GB ram / startup disk is a SSD / OS X Yosemite) suddenly started showing up the ?-folder instead of booting so I thought the SSD died. I connected the Mac ...
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2answers
103 views

Connecting external display turns MacBook screen black

For years, connecting to external monitors on my MBP 9,2 (10.10.4) worked just fine (except the occasional crash). Until yesterday, where I had three crashes in quick succession. Now when the display ...
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0answers
31 views

Can't boot, can't do a recovery, can't reinstall

I try to start in single-user mode and I get about 7 lines of text and 3 lines of dots. It says: Efiboot loaded from device: (then a long alphanumeric number) Boot file path: ...
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2answers
73 views

Prohibited sign - Can't boot after trying to open Raspian SD Card

So I was following this tutorial https://www.youtube.com/watch?v=Eo4HphBdR10 and opened the folder of the SD Card. The Screen went black and I rebooted. Now I get a Prohibited Sign on boot up. In ...
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1answer
290 views

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

Last night I was using my late 2012 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 ...
2
votes
0answers
48 views

Unable to Boot MacBook using any means after attempted Fedora Install

Wondering if anyone has any last ditch efforts I can try here to salvage my macbook! I recently attempted to install fedora to dual boot on my Late 2011 Macbook Pro, the install crashed, the ...
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0answers
61 views

Cannot change startup disk - Yosemite

I've got a clean install of Yosemite on a brand new hard drive. All good, up and running (got to boot to it manually). As the title says, I can't get the system to boot from this hard drive. Error ...
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0answers
47 views

MacBook freezes and can't restart without PRAM reset

I have a Mid 2012 13-inch MacBook Pro and am running OS X Version 10.11.2 (El Capitan). When my problem first occurred, I was running Yosemite. Here's the short story: my screen will occasionally ...
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1answer
302 views

iMac Boot Camp: No bootable device error when installing Windows 7

System: iMac (21.5 inch, Mid 2010) OS: Yosemite 10.10.5 I used Boot Camp Assistant to create a bootable USB for a Windows install (I have a Windows 7 ISO image through school) and a partition, but ...