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

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1answer
302 views

Failed startup after 10.10. upgrade

After upgrading to 10.10.4 from 10.10.2, my Macbook Pro (late 2013) boots up to a blank screen with the mouse cursor displayed briefly every 10 seconds. Booting to safe mode and resetting the SMC or ...
0
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0answers
23 views

Black screen every boot

I have a new 2014 MacBook pro. Since some days, I get a black screen for every boot. So I always pressed 'cmd + option + r + p' when the booting sounds comes and it works again. Any idea how I can ...
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2answers
31 views

Dual-Boot Win7 and Apple?

First off, I have no idea what Apple calls their OS. I only use their iOS devices and I tried to avoid their computer OS as best as possible, however, I'm getting started in developing iOS apps. I ...
0
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1answer
159 views

2008 MacBook Air Can't Boot OS X Snow Leopard USB Install Drive

I have a 2008 MacBook Air (MB003LL/A / MacBookAir1,1 / A1237 / 2142), and I am trying to reformat it with OS X 10.6 Snow Leopard, using the retail install DVD image snowleopard_10a432_userdvd.dmg ...
1
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0answers
19 views

Macbook Pro not starting after multiple drops.

I've found a 'cheap' Macbook Pro mid 2012 13" laptop for sale on eBay and it would seem to be a great bargain if I were to get it. Even with all the repair costs, about half the price of a fully ...
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2answers
64 views

Unable to use gpt to restore efi partition

I accidentally deleted my efi partition, which I now know is bad news bears. I found a guide here to restore it without losing data, but even though I'm booting from usb and have unmounted all ...
0
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1answer
41 views

Can't Boot from Snow Leopard anymore after having installed mavericks on an external HDD

I have a Macbook Pro running Mac OS X 10.6. I wanted to test how mavericks works on my computer so I downloaded the OS and then I installed on a external USB HDD. Everything work as expected. I can ...
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0answers
291 views

Prohibitory sign on Mac startup running Yosemite

I used disk utility today on my MacBook Pro running Yosemite to create a bootable USB. I don't recall touching the hard drive of my MacBook Pro at all. After I finished the process, I went onto Google ...
3
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1answer
226 views

Booting from another mac's hard drive

My Macbook recently developed a video card problem, and I got another Macbook, both running Yosemite (though perhaps different subversions). I got my old hard drive out and connected it to my new ...
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0answers
98 views

Can't boot normal or from recovery HD

Yesterday my MacBook Pro 15" Retina stopped booting. I see the Apple logo and a progress bar which gets stuck at about 10%. What I tried so far: Booting in recovery mode - same, progress bar stuck ...
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0answers
47 views

Spotlight indexing every time system restart or boot

Every time I restart or boot my Macbook Pro 2015 running Yosemite 10.10.4 bought yesterday. Please help is this normal behavior for a newly bought Macbook Pro 2015 model to do? P.S. I don't have any ...
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2answers
47 views

What is wrong with my mac?

Suddenly today my good old MacBook pro from 2012 won't start. I get the gray screen of death. I have tried safe boot, recovery boot and Internet recovery boot and it all results in a static gray ...
1
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0answers
47 views

Boot stuck at Prohibitory screen

I'm using Macbook Pro 2012 running Mac OS X 10.10.3 and earlier today, I was trying to install Linux on a USB drive through Terminal. I first converted the format with this: hdiutil convert -format ...
0
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1answer
74 views

Hard Drive Change SSD - Macbook Pro

My Macbook was slow, and then i've want to make it faster, it is a Macbook Pro from 2011 or 2012, can't remember it. I bought a Samsung SSD 850 EVO. Firstly what i did, was to take out the old ...
0
votes
1answer
210 views

OSX Yosemite bootable usb drive circle slash (“no” symbol)

I have a Late-2011 Macbook Pro (4GB RAM) that has been running slow for several OSX cycles, and since Mavericks it's been unbearable (spinning beachballs whenever you do anything). I tried upgrading ...
0
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1answer
130 views

MacBook Pro won't start up

This is a 15" 2010 model that came with OS X 10.6 and now has 10.10 installed. After turning the computer on I can hear the startup chime and the power adapter indicator light lights up. The Apple ...
0
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0answers
50 views

Why does my MacBook Pro (mid 2010) not boot OS X 10.9.2?

My MacBook Pro mid 2010 does not boot anymore from the HDD with installed OS X 10.9.2. I came across this solution which is clearing the NVRAM, but my Mac keeps showing the Apple logo and a spinning ...
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0answers
101 views

OSX intall usb key not detected

I've trying to reinstall a clean OS X Yosemite on a Mac Book Pro (mid 2013 model) for the past few days but had no success. I created a bootable usb drive using createmediainstall (as on this: ...
0
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2answers
309 views

How do I repartition my Mac to get rid of my dual boot setup?

I setup dual boot on my Mac (with Ubuntu) and want to get rid of it. The Disk Util GUI shows me: However attempting to remove the disk0s4 or disk0s5 partitions results in: Could not unmount ...
1
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1answer
60 views

Disk Utility works forever at trying to repair partitions

My computer froze yesterday while I was using a browser. I restarted and never got past a plain white screen. Finally was able to boot from a different drive and ran disk utility on my main boot drive ...
0
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1answer
44 views

Cannot press Shift+T in OS X

Since a few days, I am not being able to press T and any other key on my Wired Apple Keyboard. Nothing happens when I press Shift and T. Keyboard shortcuts like Cmd+Shift+T don't work. Cmd+T works. ...
0
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1answer
238 views

Slow Internet Mac Yosemite Recovery Doom (MacBook Air, Early 2015)

Product: MacBook Air(early 2015) with OS X Yosemite. The issue is, that I happen to have my Yosemite reinstalled, so I restarted my MacBook and at the sound of the chime(startup sound of Yosemite), I ...
2
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0answers
49 views

Why does my USB hub hide a directly attached drive from the boot menu? (post-Filevault)

I recently enabled FileVault on both my mid-2012 Retina MacBook Pro and my external USB drive containing a Carbon Copy Cloner backup. My external drive is attached directly to the MBP. I also have a ...
0
votes
1answer
126 views

How can I get Windows to install in Legacy (BIOS) boot on my mid-2012 MBP

I've got a 13" mid-2012 MBP running OS X 10.10.3 Yosemite. I've recently repaved it with a fresh install and now I'm getting round to Bootcamp`ing it. I've installed Windows 8.1 in EFI boot mode and ...
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2answers
220 views

MacBook Air won't start up, won't enter secure mode and repair in Disk Utility

Unfortunately some data was downloading and my Mac got stuck, so I forcefully power it off. After that, I couldn't enter the login screen, because the loading bar was stuck. I tried to enter safe ...
1
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1answer
30 views

Default ubuntu to boot in startup manager causes ubuntu to not work anymore

I have installed ubuntu alongside os x. I can start it by pressing the option key during startup and choose the correct disk. Everything works. Now I want to default the ubuntu disk. That works by ...
0
votes
1answer
29 views

SATA cable problem?

I have a MacBook Pro 8,2 (15 inch, early 2011) running Yosemite (with encryption enabled). I have a strange problem that seems to relate to my boot drive (Samsung 840 Pro SSD). The system runs great ...
1
vote
1answer
83 views

Why does my Mac Pro boot to black screen with third-party video card when holding Option key?

I have a Mac Pro 2012, and recently installed a new Gigabyte GTX 760 graphics/video card. I also have Windows 7 installed on this computer on my Bootcamp partition. When I attempt to start up my ...
0
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0answers
24 views

iPhone 3G stuck on boot logo - iTunes not available

This might be easy on Win/Mac but I only have Linux, so no Itunes is available: I have an ooold iPhone 3G that runs iOS 3.1.3. It might be jailbroken, I can't remember because I haven't used it for a ...
0
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0answers
137 views

Mid 2012 15 inch MacBook Pro Yosemite 10.10.3 Grey Screen Startup Freeze w/ Bootcamp

Recently, I tried to log into a windows partition (created with Bootcamp) that I had not been on in a while. When I selected that partition from the boot options screen, it would freeze on a ...
1
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1answer
59 views

Gray Screen on Boot

After getting some kernel panics and failing to fix it, I decided to reinstall OS X. It now boots but gets stuck on a gray screen with the Apple logo. The odd thing is I can boot into single user ...
1
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2answers
42 views

2009 Macbook not booting up

I found a white plastic/ rubber 2009 Macbook in the IT Office of my school and was given permission to try to get it to be usable again. Currently, it is able to be charged with its magsafe connector ...
0
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1answer
33 views

iPad mini will not turn on

I can not get my iPad mini to turn on. I have tried to press the home and power button simultaneously but that doesn't work and when it is attached to the charger I hear the charge ding sound. What ...
0
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1answer
105 views

iMac won't boot to internal drive, usb sticks - Apple hardware test extended fine

My iMac is being very odd. It won't boot using the internal hard drive. It chimes, starts the Yosemite progress bar and then changes and looks as if it is about to show me the login screen but then it ...
0
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1answer
418 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 ...
1
vote
1answer
357 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). ...
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0answers
77 views

iMac 27 inch - 2013 not booting - Black Screen

My iMac 27" will not boot up. Chime does not play and the device does not power up, and shows no white screen. Only a black screen with no boot up sounds. If I hold the power button for long enough ...
0
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1answer
52 views

How to check which parts of a dead MacBook Pro 17" Mid 2010 work

Mac was water damaged. No start up chime. Charger shows green light dimmer than when plugged in to working Macs when plugged. Battery status button on side has no effect. Won't start in safe, target ...
3
votes
2answers
301 views

How to backup with Time Machine in Single User Mode?

Is there any way to enable Time Machine / tmutil and perform a backup from inside the Single User Mode? I have a Late '11 Radeongate-affected MBP that won't boot beyond the gray boot screen anymore, ...
0
votes
1answer
91 views

Cannot boot to OS X using rEFInd

I have installed rEFInd 0.8.7 on my 2015 13" MBP onto another partition however it does not detect OS X. Here are my disk partitions: /dev/disk0 #: TYPE NAME ...
0
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0answers
67 views

rEFInd keeps deleting itself

It has been some time since I have downloaded rEFInd. It was fine ever since, though later, it did start acting strange. For example, the resolution of the rEFInd window was absolutely wrong. Though ...
0
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0answers
47 views

os x boot volume

was hoping someone might be able to help me figure this out when i run the cmd "systemsetup -getstartupdisk" the output is "/Volumes/13/WINNT" My hard drive setup is a gpt schema with three ...
3
votes
1answer
3k views

Uninstall rEFInd 0.8-3.7 on Yosemite

I recently tried installing rEFInd on Yosemite using the command ./install.sh --alldrivers however it would not recognise the ubuntu 14.04 x64 for Mac disk I made and so I would like to uninstall ...
0
votes
1answer
70 views

Unable to reach Startup Manager or any boot options on OSX Leopard

I have 5 year old 17" MacBook Pro running Snow Leopard that, without any warning, is suddenly unable to locate its startup disk. I've tried every possible boot key combo, but only zapping NVRAM works, ...
2
votes
4answers
564 views

Installation of Yosemite is interrupted by a white screen at ⅓ of progress bar

The loading of the installation from a Yosemite USB installer drive is interrupted by a blank screen about ⅓ into the progress bar. The same USB drive works on another (older) MacBook Pro. The ...
0
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1answer
107 views

Stop sign when booting from internal ssd, boot goes fine if the ssd is in external case

sorry for the long post and my english. I have an early 2011 Macbook Pro 13 which I purchased in july 2011 and it worked fine until one week ago. Since when I bought it i replaced the stock hdd with ...
0
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0answers
107 views

Boot Android from USB on Mac. Has anyone tried it yet?

I'm interested in creating a bootable usb working on Mac, with Android x86 on it. I tried a couple of methods without any results. Well, maybe a bad one as I said in my other question (if you could be ...
0
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0answers
85 views

MacBook Pro keeps returning to login screen

I can login to safe boot without issue. I created a new admin account through safe boot, but upon first full login into this new account, the same behaviour as in the title showed up instantly. I ...
0
votes
1answer
45 views

4SNS TCBC - Which Mac Pro sensor is that?

Briefly my Mac Pro (4,1 Early 2009 ) stopped booting which I eventually traced to the plastic clip holding the north bridge down failing. Seems to be a common issue. Replaced the clips and now it ...
0
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0answers
47 views

How to backup, restore and erase OS X GPT using dd under Linux?

How does one backup, restore and erase OS X GPT using dd under Linux like it's shown in Archlinux Wiki using the MBR analogue: To backup the MBR: # dd if=/dev/sda of=/path/mbr-backup bs=512 count=1 ...