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

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1answer
475 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 ...
0
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0answers
21 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
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1answer
45 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, ...
0
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2answers
2k views

How to exit Recovery Mode on jailbroken iPhone

What I've searched so far says that my iPhone had goes to Recovery-Mode (Am I right?) because it stuck on Apple Logo and won't start. What I've tried so far : What is Soft DFU mode, and how do I ...
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0answers
44 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
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1answer
131 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
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2answers
271 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 ...
1
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1answer
1k 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 ...
1
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1answer
256 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 ...
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0answers
47 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 ...
0
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1answer
96 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 ...
1
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1answer
930 views

Set EFI to boot Windows via (U)EFI one time

On my late 2012 Mac Mini, I have installed both Mac OS X Mavericks (with FileVault) and Windows 8.1 (natively, not via Bootcamp): /dev/disk0 #: TYPE NAME ...
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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?
0
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1answer
126 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. ...
13
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5answers
3k views

Installing 20+ operating systems on Mac without any virtualization

For a scientific project I need to install these operating systems on my Mac Pro. The catch is... It has to run on a native hardware, no level 1 or 2 virtualization is allowed. Here is the list of ...
1
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2answers
247 views

Macbook gets stuck on Grey Screen, won't boot normally

I've tried many steps so I'll list them here, I can do a reinstall but I prefer to figure out the actual cause of the problem and I don't think a reinstall will solve it. Macbook 2007, OSX version ...
0
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0answers
31 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 ...
0
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1answer
102 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 ...
0
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2answers
197 views

Is it possible to run Android on iOS?

Ok so I was thinking, Can you run Android on a iOS device? I did some research and Android could run on ARM (Most apps would not work) but how come no one has tried to run it. Whats holding them back? ...
0
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1answer
32 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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2answers
82 views

My Macbook Pro (2011) won't boot into single user mode

I saw Possible reasons (other than Open Firmware Password Protection) for not being able to boot into single user mode?, but it didn't help any, since I'm using the laptop's keyboard. Yes, my Mac can ...
0
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1answer
56 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" ...
0
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1answer
71 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 ...
0
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0answers
93 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
60 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 ...
2
votes
1answer
40 views

MacBook Pro - not booting - going around in loops?

After a harrowing couple of days, I found this site and am hoping someone can help. I have a 2011 MacBook Pro which has recently started having problems booting. During a game session (SIMMS), it ...
0
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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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2answers
88 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 ...
0
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0answers
25 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 ...
0
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0answers
29 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: ...
0
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1answer
149 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
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0answers
46 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 ...
0
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2answers
3k views

OSX El Capitan - cannot make bootable usb stick with boot camp

I meticulously followed this tutorial, and this worked for me in 2014. I have a 4GB usb stick plugged into the computer. It should be enough for windows 7, a partition which no longer boots and I am ...
0
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0answers
49 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 ...
0
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1answer
37 views

Don't want my hard drive to die again!

A couple of months ago, my Mac Book Pro wouldn't start up - it would make it halfway through and then power down. I took it to the repair store, and they said the hard drive was broken, and they ...
0
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0answers
45 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 ...
0
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0answers
54 views

Boot Camp Assistant - Windows dosen't show up on boot!

I followed all steps to get Windows 7 on my Mac with Boot Camp Assistant and everything was working out until I was finished creating a BOOTCAMP partition and when my Mac restarted it said "No ...
0
votes
1answer
78 views

Mac Pro custom graphic black screen during boot

My 1st gen MacPro with a custom graphic card (ATI Radeon) does not show any boot prompt. Actually it doesn't show anything until Aqua comes up. I need boot prompts and pre GUI screens for multiple ...
0
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0answers
21 views

Imac 27" EMC 2546 boot issue (stalls boot at ~30%)

I've seen somewhat similar other such issues on many posts, but nothing that gives me a workable solution to my boot issue, so here is what's happening: Imac 27" late 2012 EMC 2546, with the recalled ...
0
votes
1answer
230 views

Mac book Pro [2011 model] - Screen bit distorted and greenish tint and does not boot completely after the apple logo and progress bar loads

My Macbook Pro hung so I forced restarted it but on restart the screen was bit distorted and had greenish tint (Picture below) also it never goes past the Apple logo and progress bar to boot ...
3
votes
2answers
4k views

BuildError(): error building a user of type

I'm getting a strange message each time I boot. For a quick second before the Apple Logo appears I see the text: BuildError(): error building a user of type 0x20010008 Then the Logo appears, and ...
0
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1answer
34 views

How do I instal OS X when boot combos don't work?

I'm trying to instal OS X on a 2013 Macbook Air. I erased the OS X partition, the computer is booting to my windows 7 bootcamp partition by default. All boot key combinations(C, Option, CMD+Option+R, ...
0
votes
1answer
79 views

What is it that prevents using a 3rd party SSD in a 2015 rMBP?

I bought an Early 2015 MacBook Pro Retina model with the 128GB SSD and have been wondering what to do if I need more disk space.. then I found out that it's currently not quite possible to just stick ...
0
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0answers
18 views

Create bootable windows on external HDD

Hello I'm trying to create bootable windows on this external HDD http://www.amazon.com/dp/B0046A8MSM/ref=twister_B004DTS99S?_encoding=UTF8&psc=1 but without success. I'm following this tutorial ...
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0answers
53 views

Issue with OS X Startup Disk in System Preferences when using EFI dual boot

I have Windows booting EFI on my Mac mini (Late 2012). It has two physical drives with one EFI partition (on the OS X disk). If I option boot I see OS X and EFI (Windows) choices and everything works ...
7
votes
4answers
27k views

How do I get rEFInd working with OS X 10.11 El Capitan?

I noticed that I could not install and use rEFInd after upgrading to OS X 10.11 El Capitan. This restricts me to OS X so I cannot boot my Linux partition. I get the following error: error "Could not ...
0
votes
1answer
1k views

Serious Boot / Sleep Problems

Two days ays ago I closed the lid of my macbook pre for the night as I have done for the last 2.5 years but when I opened the lid in the morning the screen didn't show. It seemed to be 'alive' (ish) ...
0
votes
1answer
3k views

How to run Apple Hardware Test with broken keyboard?

mid-2011 13" MBA running Yosemite Coffee spill has left keyboard of mid-2011 13" MBA non-functioning. Even power button doesn't work, I boot by shorting the two solder points on logic board. I've ...
0
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2answers
70 views

2007 Macbook Pro will not boot to HDD

I have a 2007 MacBook Pro running Yosemite from an off the net upgrade from Snow Leopard and the graphics went crazy while trying to watch a TV program on my Slingbox app. I forced a shut down by ...
1
vote
3answers
5k views

iMac gets stuck on the “White Screen of Death” during startup

I have a 27" iMac (from 2011) that's running Yosemite and each time I turn the power on, it shows me the Apple logo, it starts to load, and the screen goes white and simply hangs there. To solve this ...