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

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1
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2answers
3k views

Upgraded to 10.9, but it broke my Windows 8.1 Boot Camp partition!

I just got Windows 8.1 set up via Boot Camp a couple days ago, and everything was working wonderfully. Today, I upgraded my Mac to OSX v10.9, as suggested by Apple. Nobody told me it would break my ...
5
votes
3answers
35k views

Boot camp install of Windows 7 issue, no bootable devices

So I have a 2010 15" macbook pro (MBP6,1) and I replaced the optical drive with a hard disk. I wanted to install windows 7 on the hard disk with boot camp with a USB and ISO image. After searching I ...
0
votes
0answers
53 views

Stuck in update boot (not enough disk space)

I'm currently having a Macbook Air 120GB SSD where I tried to update the OSX to El Capitan. Very first it did not want to update due to lack of disk space. After I cleared up some photos so it had ...
1
vote
0answers
23 views

Macbook Air - No Apple logo but still boots

I have been looking all day for an answer to this so I thought I would pick your brains :) Macbook Air 4,1 (Mid 2011) 11 inch, i5, 2gb RAM. After pressing the power button, I hear the Apple "chime". ...
1
vote
1answer
52 views

13'' MacBook Pro 2010 stuck at blank gray screen, no boot option working

My 13'' MacBook Pro 2010 running Yosemite suddenly stopped booting today. After I press the power button, I can hear the chime and the computer proceed to go to a blank gray screen immediately. The ...
0
votes
1answer
47 views

macbook pro encounters prohibited sign while booting with USB

My macbookpro is completely empty and the only option that I have is just internet recovery. I downloaded el capitan and with help of the terminal in the internet recovery build a bootable OSX el ...
0
votes
1answer
31 views

iMac mid 2011 grey screen

On a site I have come along a pretty cheap 27" mid 2011 iMac. The seller says it's broken and when he press the power button it shows a white/grey screen and the "startup sound" plays. Is there any ...
0
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0answers
65 views

Winclone to volume not bootable

I'm trying to move my Windows 10 Boot Camp partition to an external drive. The ideal way seems to be with Winclone, however I've been unsuccessful so far. Winclone appears to clone the partition to ...
5
votes
4answers
5k 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 ...
2
votes
4answers
22k 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 ...
0
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0answers
72 views

Mac Pro 1.1 stuck on grey screen

After Software update to 10.11.4 form 10.11.3 on my Mac Pro 2006 I can not boot up from any media, like DVD, USB memory, Network, you name it, and can see only a grey screen. I have now GeForce GT7300 ...
0
votes
1answer
80 views

My Mac would turn on but it would get stuck on the white screen upon startup after chime

My Mac would turn on but it would get stuck on the white screen upon startup after chime. I have OS X 10.7.5 Tried many things unsuccessfully like: Command-R Boot to OS X Recovery Mode ...
1
vote
2answers
68 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 ...
3
votes
1answer
143 views

Dual Boot Mavericks + El Capitan

I was using El Capitan without issues till now. I'm starting to use Pro Tools 10 which is incompatible with El Capitan, so I will need to install a previous OS X version like Mavericks to make it ...
1
vote
1answer
68 views

MacBook Pro Boots only with a pressed key

I'm having a bizarre issue with my early 2011 Macbook 15'. I grabbed it today without battery power só the first thing I diz was to plug the MagSafe adapter. Afterwards I pressed the power button. It ...
11
votes
8answers
37k views

How to permanently disable (defective) graphics card in MacBook Pro?

My graphics card has malfunctioned and is preventing my MacBook Pro (2011) from booting. Based on my research I will have to otherwise have the logic board replaced. The defective ATI graphics card ...
1
vote
1answer
20 views

iMac won't open user accounts!

I have a newer (2009 I believe) iMac, running Yosemite. It powers on, the Apple logo and progress bar appear, as well as the mouse cursor, but then nothing happens, the screen just stays on and ...
0
votes
2answers
50 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 ...
2
votes
1answer
1k views

Accidently deleted some small sized partitions when installing WIndows(Bootcamp). OSX Partition wont boot

I tried to install Windows 8 into my Mac via Bootcamp. I booted into the Windows 8 Installer and had issues formatting the drive that I partitioned for the OS. Like an idiot, I deleted all of the ...
1
vote
3answers
8k 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 ...
0
votes
0answers
35 views

rEFIt Not Working with Ubuntu 12.04/MacOS dual boot after upgrade to El Capitan

I have a MacBook Pro Late 2011 and the version of MacOS 10.7.2 Lion and I've always been using it no problem, so I didn't update to any of the newer versions of Yosemite, Mavericks, etc. On this Mac, ...
0
votes
1answer
54 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 ...
0
votes
1answer
62 views

USB Win 7 boot disk shows in rEFInd but booting from it loads BootCamp partition instead

I'm having issues with my BootCamp installation of Win 7 Ultimate and want to troubleshoot it using a USB Win 7 boot disk. I created the USB disk in yet another Windows system in Parallels Desktop, ...
0
votes
0answers
49 views

Can't boot from bootable Windows 10 USB?

I asked this question a little bit ago but it was on a guest account that I on longer have access to. So I'll ask again. I created a Windows 10 installer USB using hdiutil convert and dd. Running ...
0
votes
0answers
57 views

Fixing black screen and login issues

Recently I've been having trouble with my Macbook Pro crashing seemingly at random. This typically happens when I try to wake the machine from sleep (if it matters, I usually cause the computer to ...
0
votes
0answers
25 views

Can't boot from Windows 10 USB?

I created a Windows 10 installer USB using hdiutil convert and dd. Running diskutil list shows: /dev/disk1 (external, physical): #: TYPE NAME SIZE ...
0
votes
0answers
31 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 ...
0
votes
1answer
102 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 ...
1
vote
2answers
75 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 ...
1
vote
1answer
165 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. ...
0
votes
0answers
27 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 ...
1
vote
0answers
58 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 ...
0
votes
1answer
196 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 ...
0
votes
1answer
150 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 ...
0
votes
0answers
12 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 ...
1
vote
1answer
29 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 ...
1
vote
1answer
220 views

iPad stuck in boot up loop. 4013 error after multiple restore attempts

After speaking with Apple's tech support, and having them perform a data capture on my machine, I sit stuck with an iPad that won't boot up. I've attempted all trouble shooting listed here. I've ...
3
votes
1answer
2k views

MBPr with El Capitan freezes at or right after login

Here's the problem: my colleague has a MacBook Pro Retina with El Capitan installed and he's been having issues with regular freezes lately. Everything has worked fine under Mavericks for well over a ...
0
votes
1answer
41 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 ...
0
votes
0answers
4k views

Single User Mode not starting

First of all, there's no firmware password or anything fancy. I'm trying to diagnose a late-2011 MacBook Pro 15", and I'm trying to get into the single user mode. I press and hold Cmd+S (the left Cmd, ...
1
vote
1answer
63 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 ...
6
votes
2answers
61k views

What are next steps when fsck reports “could not be repaired after 3 attempts”?

My Mac Book Pro 13.-" doesn´t get past the grey booting screen with the apple and the spinning wheel (The loading bar appears but when it´s done nothing happens) I have 220 GB in one single ...
0
votes
0answers
44 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 ...
1
vote
0answers
144 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 ...
0
votes
3answers
7k views

Is it possible to make a bootable USB stick for a Macbook Pro to do firmware update?

I know there are some possible duplicates. But the questions are not solved. Such as: Copy Crucial SSD Firmware Update ISO to Bootable USB I am trying to upgrade the firmware of my SSD (crucial m500) ...
0
votes
1answer
26 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 ...
0
votes
0answers
32 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 ...
2
votes
1answer
32 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 ...
1
vote
0answers
35 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 ...
9
votes
5answers
36k views

How do I make my 1.5 GHz PowerBook G4 boot from a USB stick?

I actually want to boot Linux but since that is not working I'm thinking some one might know on the Apple end. If there's a way to boot Mac from a USB stick, then booting another operating system ...