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

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1answer
156 views

How to fix bootcamp boot after removing hybrid MBR

I've updated bootcamp to Windows 10 which should support GPT with protective MBR without any hybrid tricks. I have 6 partitions on disk0 so hybrid MBR is also inconsistent with GPT and it's somewhat ...
3
votes
1answer
707 views

Not enough storage for El Capitan; no way to free up space

I wanted to upgrade my Macbook 2008 from Yosemite to El Capitan. Unfortunately, when I downloaded it and restarted my computer, on the "select the disk on which to install" page the only location, ...
0
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1answer
71 views

Boot Camp makes unbootable USB drive

I used Boot Camp Assistant to create a Windows 10 install disk. However, the disk is not bootable. I am confused as to why Boot Camp Assistant would make an install disk not bootable. Can someone ...
1
vote
1answer
250 views

After login mac is stuck on progress bar

I have 15 inc Mac book pro with Mavericks installed. I can successfully on the Mac but I cannot login to my account. Upon press enter I get progress bar and after that I get grey screen then nothing ...
2
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0answers
43 views

Bootcamp: How do you reboot from Windows to Windows via script in OSX El Capitan?

I'm asking this because I think it would be incredibly useful to myself and other Bootcamp users. I currently have my default boot drive set to restart to my Mac partition and already have a script ...
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2answers
69 views

Creating a bootable Linux distro compatible with Mac OS X [duplicate]

I have downloaded the appropriate Linux distro (in this case Fedora Xfce Live) and I have partitioned the USB with Disk Utility and attempted copying both the Fedora iso, and a Fedora iso converted to ...
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0answers
142 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
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0answers
26 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
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1answer
97 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
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1answer
38 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 ...
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0answers
116 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 ...
0
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1answer
130 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 ...
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0answers
90 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
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1answer
114 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 =>...
3
votes
1answer
354 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 work....
1
vote
1answer
31 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
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0answers
61 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, ...
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0answers
69 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 ...
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0answers
88 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 ...
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0answers
31 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
1answer
122 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, ...
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0answers
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 ...
0
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2answers
61 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 ...
1
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2answers
253 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
85 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
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1answer
671 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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0answers
40 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
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0answers
89 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
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1answer
331 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
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1answer
344 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
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0answers
15 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 ...
0
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1answer
74 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 ...
1
vote
1answer
32 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 ...
0
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1answer
60 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 ...
1
vote
1answer
116 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 ...
0
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0answers
54 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
197 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
1answer
36 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 ...
2
votes
1answer
46 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 ...
0
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0answers
38 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 ...
1
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0answers
53 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 ...
0
votes
5answers
649 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 ...
2
votes
2answers
880 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 Display)...
0
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0answers
28 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 ...
0
votes
1answer
57 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
57 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 ...
0
votes
1answer
235 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 ...
1
vote
1answer
136 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 ...
1
vote
1answer
3k 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 ...
0
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0answers
89 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 ...