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

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kernel extension is not always loaded at boot time on OSX

I do have a kernel extension for USB-Devices using IOKitPersonalities. Replugging one of the devices the kext will always be loaded as expected but for devices already connected at startup this ...
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1answer
37 views

unable to boot Mac OS after installing bootcamp

Installed bootcamp Win7 on my MBPro with Yosemite a couple weeks ago and both OS's worked fine for some time, until recently the Mac OS suddenly decided it couldn't boot anymore. If I select the Mac ...
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1answer
117 views

OS volume shows as type 'FFFFFFFF-FFFF-FFFF-FFFFFFFF' after attempting to delete some Linux partitions—cannot log in

I was unable to just delete the partitions left by an old Linux Mint installation by pressing the '-' button in disk utility. I looked online and read that I could reformat them to a journaled format ...
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1answer
78 views

2012 Macbook Pro Boots With Startup Sound, But Has Black Screen

This is sorta urgent, since my dad's whole business relies on his computer, and it needs to be fixed. Anyway, it will startup and and make the mac "on" chime. But after that, nothing happens. We can ...
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0answers
425 views

'the 'grub-efi-amd64-signed' package failed to install into /target/' during Linux Mint installation on an iMac

I have a Mid 2007 iMac, I've installed rEfind on the mac and the Linux Mint (Cinnamon 17.3) installer on an USB thumb drive . rEfind sees the USB thumb drive, sees grub installed on the key, I boot ...
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0answers
70 views

Boot Windows from USB with EFI password

I've created an USB with Windows 10 from where I can boot: Restart pressing option. Select USB EFI partition. Windows starts. When EFI password is active it will be asked when booting pressing the ...
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1answer
89 views

NTFS appears every time

Every time I boot my Mac, an "NTFS for Mac OS X" window appears. In the settings I can't change this. Here is the window I have El capitan 10.11.4 I found this: To resolve the issue you need ...
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1answer
26 views

Mac Pro 2,1 updates and firmware question:will the firmware from the older work with the newer and vice versa?

I'm pursuing an alternative boot drive so i can explore a yosemite or elcapitan environment from my old mac pro 2,1 currently in the last version of snow leopard. (with legally purchased soft ware ...
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1answer
26 views

Holding Down Control at Startup Manager (Boot Disk Selection) Screen

I noticed that when I hold the control key at the screen where you select a boot disk (the screen obtained from holding down option at startup), the straight arrow below the selected boot disk turns ...
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4answers
1k views

How do I know if I need a new hard drive?

I just received a MacBook Pro from somebody else because it was running too slow. Booting up takes about 4 minutes. I have tried formatting the drive and reinstalling the operating system from ...
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1answer
148 views

MacBook Air charging light stays amber and does not go green and machine does not boot or even chime

I have an 11" MacBook Air 6,1 from mid 2013 that I found discarded and had restored but now seems dead again. I got the machine with a broken screen backlight and missing SSD. I took it to the Genius ...
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1answer
131 views

How to check if secure boot is enabled in OS X?

I got this question is secure boot enabled? but I do not know how to check it in my Macbook Air 2013-mid with El Capitan 10.11.4. How to check if security boot is enabled in OS X?
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0answers
29 views

Mac OSX EFI problems, urgent help needed!

So, I recently did an update on OSX, booted my computer up and I discovered that I the update replaced my EFI boot rom and the SMC with the incorrect SMC, so now I can't use my battery and the ...
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0answers
12 views

iMac 24" 2.16 ghz core2duo

I'm trying to install Snow Leopard but iMac won't boot from the install disk. I've also tried booting from a flash drive with Snow Leopard Install on it with no luck. It also will not boot from the ...
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0answers
64 views

iMac A1208 - Mac OS X 10.4 Install Problem

I'm a French user and I have a iMac from 2006/2007. I have changed the logic board. It's ok, but i want to do a fresh install of OS, (10.4), but the optical disk is KO. I have the official CD (but it ...
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1answer
35 views

Bootcamp cannot find both systems at startup

Something strange happened: I closed my macbook pro while using windows 10 When I opened it again it didn't wake up for a while so I forced it to shut down by pressing the power button for 10 ...
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0answers
10 views

iPad mini won't boot

My iPad Mini's battery was drained and I tried to charge it. When I came back I tried to open it but neither the apple logo and charging sign appeared. I tried to press and hold the home and reset ...
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1answer
23 views

MacBook Pro (2006, A1150) fails to boot

My MacBook Pro (2006, model A1150) fails to boot beyond the white screen AFTER the screen with the Apple logo and spinner. I have tried: Resetting PRAM (doesn't work) Resetting SMC (how can ...
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1answer
24 views

Is it possible and relatively easy to boot a 2013 MacBook Air from an external drive?

Given a MacBook Air that's working but with dead display and SSD, can I use it as a desktop-only machine with an external monitor and external hard drive? The guy at the Apple Store Genius Bar this ...
0
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1answer
156 views

Can't boot into OS X Recovery Mode

I would like to I've recently installed Debian Linux on my Macbook, which required repartitioning the hard drive. I now can't boot into Recovery Mode. Holding down Command+R on boot brings up ...
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1answer
73 views

Run nrpe on boot w/o a logged in user

Running a Mac mini with server app. (El Capitan 10.11.4 & Server.app 5.1) Installed Xcode, brew, and nrpe via brew. Works fine as such. It's not sensible to have to remote desktop to it and log ...
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1answer
66 views

Can not boot MacBook Pro 2011

I have a MacBook 2011 running OS X 10.11.5, 16GB RAM, 512GB SSD Drive. Today when I am restarting my computer, I accidentally pressed Cmd+R while booting. Now I try and restart my computer, it shows ...
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1answer
251 views

Installing El Capitan from a bootable DVD

I have El Capitan on a bootable DVD. I restart my Mac and hold the option key until the disks come up and I choose EFI Boot (name of the disk is different than what it shows at the time of booting). ...
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0answers
36 views

How to get rid of the boot gong sound without OS X Installed?

If you google it, there are tons of solution with writing to NVRAM from OS X Terminal, but on my MacBook Air I deleted OS X in favor of Windows. Edit: I already got the tip here to start the Apple ...
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1answer
200 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 ...
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1answer
1k 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, ...
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1answer
88 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 ...
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1answer
370 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 ...
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0answers
49 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
72 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
178 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 ...
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0answers
27 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". ...
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1answer
132 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
41 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
143 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
182 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
99 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
123 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
492 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....
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1answer
35 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 ...
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0answers
68 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
75 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
112 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
33 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
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1answer
163 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
34 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
70 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
404 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
89 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
1k 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. ...