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

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Macbook Pro boots successfully when using hard drive in USB enclosure but doesn't boot when connected internally

Apologies for the long question. I will keep it as simple as I can. Last week my Macbook Pro (13-inch, Mid 2010) started to act strange. It started when I tried to open Skype and received an error ...
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1answer
1k views

Command+S At Boot Doesn't Activate Single-User Mode

10.6.8. Hold down Cmd+S throughout the entire boot process. It always goes to the regular login screen and starts doing the "stop holding down buttons" chime. Why?
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1answer
198 views

Do the new macbook pro models (2011) still have a 4 partition limit?

If I remember correctly, the older Macbook pro models (pre 2011) had a 4 partition limit: so, if you tried to install multiple operating systems, you had this limit. Do the new models (2011) still ...
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2answers
21k views

Mac Pro: Any way to recognize a bootable USB on startup?

I have a Mac Pro 2,1 2x6-Core Xeon@2.66 GHz and am trying to boot from several ISO images written to USB sticks. I have tried the dd-based methods as recommended by Ubuntu, with no luck. In every case ...
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2answers
686 views

How to remove boot from MacMini?

I have tried installing windows 7 on my MacMini. I followed following steps. Setup went perfectly But while installing I thought of not installing it. So, I just restarted mac mini. Pressed Alt ...
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4answers
1k views

repaired disk/permissions, now imac won't boot into login

My iMac has been running horrendously slow the past couple days, so I booted into the Snow Leopard CD and ran a disk repair and a permissions repair. Now I can't get past the spinner. It's been ...
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2answers
795 views

Macbook Pro.[Mid-2012] Sound isn't working

Suddenly, My MBP sound isn't working. I have tried couple of way to resolve the problem but nothing is working. Here is some of the screenshot: No, input or output sound. I would like to know 1) ...
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3answers
71k views

How do I create a Mac bootable USB drive using Windows?

My MBA 2012 with OS X 10.9.4 Mavericks won't boot anymore - it simply freezes after the initial jingle. I already tried resetting NVRAM and SMC, but to no avail. I don't have any time machine backups. ...
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2answers
8k views

Dual booting Yosemite/Mavericks: Stuck in Yosemite with an 'Install OS X' volume instead [closed]

I've made a partition on my hard drive, so I currently have Macintosh HD (call it 1) and Macintosh HD 2 (call it 2). I downloaded the Yosemite installer with my Mavericks install on 1, then ran it ...
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3answers
30k views

MacBook Pro can't boot: shows Apple logo then grey screen

There is a MacBook Pro from 2012 with Mountain Lion that won't boot. The Apple logo is showing, the spinning wheel and then it just goes to a solid grey screen. I've tried to hold Cmd+R while ...
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1answer
8k views

What does boot.efi actually do?

I understand that when a Mac's EFI system runs, it locates the file boot.efi in the /System/Library/CoreServices/ (blessed) directory and runs this as an EFI application (subverting a large part of ...
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1answer
887 views

Can't boot from Snow Leopard DVD

I bought a new hard drive for my 2011 MacBook Pro and did the following steps: Backup using Time Machine Replaced the hard drive Put in a Snow Leopard DVD (10.6 from ~2009) Booted holding down the c ...
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2answers
1k views

Installing windows on late 2009 iMac 27"

I've sucessfully installed Win 7 x64 twice on my imac before. However the 2009 iMacs had faulty HDD, I had it replaced and after that I have trouble installing windows. I know about the display ...
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3answers
1k views

How to enter boot menu without command key?

My Macbook air has a keyboard issue, the Z key does not work except upon startup where it becomes stuck for several seconds. This interferes with opening the boot menu on startup, because it detects ...
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1answer
2k views

Formatted a Bootcamped drive as a dynamic disk, now can't boot to either Mac or Windows

I was trying to create an extra partition to get a file from the Windows side of my Macbook Air to the Mac side, and I accidentally made the disk dynamic without realizing it. I am now unable to boot ...
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3answers
1k views

New Corsair ram beeping on late 2008 MacBook

I purchased Corsair RAM memory (2x4GB) CMSA8GX3M2A1066C7 from Amazon.com. According to the description it "Works with any Mac computer that supports 4GB DDR3 SODIMMs". My MacBook supports 6GB ...
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2answers
1k views

How to tweak boot time by disabling apple kexts (including cryptography related ones)?

Initially, I am running OSX Mountain Lion on a mid 2010 6,2 MBP. I wanted to enhance my boot time a little, maybe by disabling some official apple kexts. Has anyone played with that, knowing which ...
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2answers
3k views

MacBook Pro won't boot anymore after a fall

I have an old MacBook Pro (late 2006) and he won't boot anymore. He fell down the table and ever since, he's not working anymore. When I try to boot him, the hard drive and the fans starts spinning, ...
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2answers
553 views

Is is possible to prevent OS X firmware password removal?

The title pretty much says it all. I have set a firmware password on my MacBook Pro just to make things a bit harder in case of theft. Still, by pulling the RAM and resetting the PRAM, it would be ...
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3answers
9k views

Troubleshooting MacBook Air boot issues

I have a late-2010 MacBook Air (11inch, 3,1), running Snow Leopard. I hadn't run software update in a month or two, so I plugged it into the wall and ran software update last night. Unfortunately, ...
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1answer
137 views

Can you run Disk Utility from bootable lion disk?

I've made a bootable lion disk by extracting the InstallESD.dmg from the lion installer app's package contents. - (Contents>SharedSupport>InstallESD.dmg) When booting from this disk, can you run disk ...
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3answers
252 views

Diagnosing a broken laptop

I have a 12" PowerBook with no HD and a dead screen. I'm trying to determine if the actual LCD is broken or if it is "just" the graphics card, without taking out the screen and transfering it to ...
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1answer
80 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 ...
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5answers
21k views

How do I fix my SSD after installing Yosemite and Enabling TRIM? No boot & can't erase

I recently upgraded to Yosemite, enabled FileVault and foolishly enabled TRIM (had no idea it wasn't supported). Upon restart, my machine gets the grey screen with the crossed-out circle of death. ...
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2answers
3k views

Mac wont boot and fan runs high

My Mid 2013 macbook pro recently will no longer boot. I was using it normally (no excessive use) and then all of a sudden it just went black and shut off immediately. I can no longer boot it (I got it ...
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2answers
1k views

Macbook Air intermittently can't find startup disk

About six months ago, my Macbook Air started having a strange issue where it would often not be able to find the startup disk, giving me the flashing question mark. Initially, I was convinced the hard ...
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2answers
1k views

My MacBook Pro has a flashing question mark in a folder against a grey background

My MacBook Pro shows a grey screen with a flashing question mark in a folder. I tried connecting it to an older MacBook using firewire cable. I restarted the Macbook Pro in Target Mode. Now I see ...
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1answer
259 views

Why the launchd has multiple instances per user (not only me and root, but also _spotlight and _windowserver)?

I found that the launchd process has multiple instances in the process list. What is looking interesting is that there are four users under which these launchd processes are running: root < ...
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3answers
5k views

Replacing “apple hardware test” with “apple diagnostics”

According to this article, holding down the "D" key while my MacBookPro11,3 boots should bring up "Apple Diagnostics". However, "Apple Hardware Test" comes up instead. When I try to run in, it ...
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3answers
1k views

How can I wipe a disk from a Mac with firmware password set?

I'm in a somewhat odd situation: I need to wipe the disk of a MBP, but I can't boot into Recovery Mode/from a CD/etc. as there is a firmware password set. Is there a way to wipe the disk from within ...
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1answer
605 views

How Can I access Mac OS X Base System on Boot Screen?

Im going to try to wipe out my hard drive and reinstall Mavericks but whenever i reboot the iMac and hit the OPTION key it won't show Mac OS X Base System. Can anyone help me on this?
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2answers
355 views

Mac USB Linux boot disk

I have a 13" MacBook Pro early 2011 model. It will not boot from any Linux USB boot disks I have created. I know these disks are working on later models as I have tried with 2012 Retina 15" booting ...
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1answer
126 views

Pendrive bootable not showing after trying to reinstall Mavericks

I did the steps to reinstall OS X Mavericks. I created a bootable Pendrive but it doesn't show when I hold down "Option" at boot. I already erased my HD, so I'm stuck now! How can I reinstall OS X ...
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4answers
3k views

Gray screen immediately upon boot. Cannot enter into safe mode, and cannot show boot loader with the Alt key.

How the problem came to be: I wanted to dual boot Debian on my MacBook Pro 8,1. I got my USB ready, downloaded ISO, and installed rEFInd. I restarted to make sure the new boot manager worked. It ...
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1answer
997 views

Can I “restore” an iso image to my hdd to be bootable?

I removed my superdrive a while back but now I want to install a linux partition on my macbook. I installed rEFInd as my boot manager but now I need to boot into the arch linux iso. Normally I would ...
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1answer
3k views

restore Mac OS Mountain Lion to factory settings without discs or time machine backups

I installed XCode 3 on Mac OS Mountain Lion 10.8 and now I am getting the Apple BSODs. Can I do a system restore without having the discs as I seem to have nothing to use, also I have no Time Machine ...
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2answers
371 views

Lion Boot from a Flash Drive Mac

So I'm trying to load a Lion DMG onto a 16GB flash drive according to this tutorial, but I only get as far as step 9. The data starts to restore to the flash drive, but right as it gets to the end, ...
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1answer
189 views

Is this fun partition mess I have made fixable on the Mac OS X side?

On a MacBook Pro, a wrong decision long time ago still causing numerous problems. In a nut shell, I run bootcamp and OS X together on the same drive and the OS X stopped booting a while ago (I was ...
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2answers
135 views

Keyboard shortcut to prevent login items from loading but still allow extensions

I know that if I boot my Mac while holding down Shift, then it does "safe mode" which causes it to boot without either login items or extensions. I often want to boot the computer and not load login ...
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4answers
658 views

Is the boot time of an iOS device affected by the apps that are running at shutdown?

I suspect that apps that use system services might take time to register each app in the appropriate places at startup. Is the boot time of an iOS device affected by the apps that are running at the ...
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1answer
777 views

What's the startup/reboot time for iPad (3rd generation) compared to other iOS devices?

I'd like to know, in people's personal experience so far, about how long the new iPad takes to start up (in seconds), especially when compared with other devices running iOS. For the purposes of ...
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1answer
2k views

Create bootable USB drive from Linux ISO

I'd like to take a Linux ISO (e.g., CentOS, Ubuntu), and create a bootable USB drive. (It will be used for booting on a stock PC, not on the Mac). How do I go about creating such a drive using a Mac?
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2answers
5k views

Constantly ejecting OS X install disc when trying to boot

When trying to boot from the OS X install disc (Snow Leopard) my Macbook will just eject the disc and boot normally from the installed system on the hard drive. Once booted, the disc can be read fine ...
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2answers
512 views

My personal settings on OS X disappear after booting Windows (XP or 7) on my MacBook Pro

I installed Windows 7 (and XP before) on my MacBook Pro and whenever I boot my Windows and after that boot my OS X my clock shows the wrong time and my login items that I set in the system preference ...
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1answer
93 views

Can I stop my Macbook Pro booting into Windows automatically?

I've got my Macbook Pro (early 2015) set up with Boot Camp. Normally, when I switch it on, OS X starts. But I can press Alt/Option to get the boot menu, and select Boot Camp Windows from there. Once ...
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1answer
169 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 ...
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1answer
57 views

Startup disk not correctly identified?

I have a Mid-2010 4 core MacPro. I mainly run 10.6.8, as I have a large software investment I'm not ready to abandon. As part of my migration to the present day OS, I have multiple startup drives, 2 ...
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3answers
250 views

Is it possible to boot from an encrypted external hard drive?

If I have an external hard drive with a bootable cloned backup (via SuperDuper) - if I encrypt it with the Finder will I still be able to boot from it if necessary? Are there any solutions to enable ...
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1answer
87 views

Flashing question mark, low hard drive space

When I booted my Mac last night I got a flashing folder against a gray background. The computer started fine this morning, but when I closed the lid and opened it up again I had to reboot, and now ...
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1answer
56 views

MacBook boots automatically when opening lid. Feature or problem?

When my 13" Retina MacBook running Yosemite is powered off and I open the lid, it immediately starts booting up... without pressing the power button. Is this a new feature (maybe part of Yosemite) or ...