Questions tagged [boot]

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

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iMac will not boot

An office iMac will not boot - it sits at the gray startup screen with the progress circle spinning continuously. I have tried: Booting in safe mode (same result) Booting in recovery mode (same ...
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3answers
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Logging out and in on OS X takes 4-5 minutes?

I've got a 3.4 GHz i7 iMac (8 cores) with 24 GB of RAM. (2 16 GB chips plus 2 4 GB chips.) I know this amount of RAM is "officially unsupported" which is why I mention it. Lately logging out (to ...
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4answers
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Installation stuck at grey boot screen on Macbook Pro 4,1 (Early 2008)

I would appreciate any help you guys can give me since I would really like to upgrade my laptop to Mountain Lion. Computer: Macbook Pro 17" 4,1 (Early 2008) RAM: 4 GB RAM Hard drive: 128 SSD Hard ...
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Macbook Pro (Late 2011) Bootcamp and USB boot questions

I have a Macbook Pro with an OWC DataDoubler drive caddy replacing the Superdrive (installed at an Apple premium reseller, when I bought it, so I can still have my warranty). The main drive slot has ...
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3answers
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How do I clone a dual-boot Macbook

I have a Macbook Air set up for dual-boot (Lion & Windows 7) and am planning on buying a newer model. How would I go about cloning the entire hard drive to the new machine? Do I need to ...
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2answers
23 views

can't boot on win10 without alt (option)

on an air macbook air 2017, I deleted OSX and installed only Windows 10 from a usb cd drive. Everytime I boot the computer, I have to push on ALT to select the only one item: Windows. Otherwise I get ...
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1answer
1k views

Can't boot Macbook Pro 2018 (possibly Little Snitch/Mojave related)

I have a Macbook Pro 2018 15" running Mojave (latest update). After updating to the latest Little Snitch and restarting my machine it now fails to boot. I boot up and can enter my password (I'm ...
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2answers
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tmutil - Failed to delete local snapshot

My mbp is stuck on boot and fsck cannot be performed because of: snap_metadata_val object (oid <aléatoire>): invalid extentref_tree_oid (0x0) It happens that I have dataless snapshot and if I ...
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2answers
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Dual boot: I cannot boot in OS-X, after installing Linux (Debian)

After swapping the DVD drive with an SSD, I installed Debian Linux on it. I left the original SSD with OS-X untouched. After a reboot, OS-X (El Capitan) started. After another reboot, pressing ...
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1answer
203 views

Install SSD and Windows to Mac Pro 2012

I have what I believe is a Mac Pro from 2012. It has 2 CPUs, 12 GB of RAM a 5770 and no disks. I want to stick an SSD in it and install Windows. The Mac Pro does not currently have any disks and hence ...
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1answer
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How do I install Linux on a 2007 iMac that has its operating system uninstalled?

I'm in a bit of a pickle. The iMac will prompt me to reinstall OSX Lion, but it only has 1GB of RAM, and the Lion upgrade requires 2GB, so it doesn't allow me to do that. Since the computer was ...
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1answer
632 views

I am unable to boot my mac in El Capitan and Single User mode

I am unable to boot El Capitan. When I turn on the computer it seems to load fine for a while, but then this screen shows up: When I try to boot into Single User mode, it stops loading at this point:...
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2answers
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Funny Apple Logo colors during startup

When my iMac boots up the apple logo and progress bar flicker red very briefly. There doesn't seem to be anything else the matter with the computer apart from this. It's a very new retina iMac running ...
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3answers
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Mid-2010 Macbook Pro won't boot after trying to install macOS Sierra

After I ran the macOS Sierra installer to start installation, my 2010 Macbook Pro wouldn't start anymore. It would get to the grey startup screen, flash the Apple logo for a second, and then switch to ...
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2answers
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Old Mac OS X, cannot get admin access, boot safe or single-user mode, nor reinstall

I have inherited an old Mac OS X 10.5.8 + original install DVD. Model: Power Mac G4 Identifier: PowerMac3,6 Processor: PowerPC G4 (3.2) DVD: Mac OS X Leopard Install DVD Version 10.5 I'm trying to ...
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Boot up error prohibitory sign flashing folder with question mark

3 weeks ago my hard drive failed so I bought a new one. (Macbook pro late 2011) 5 days ago, the new one flashed prohibitory sign, flashing folder with question mark. Every once in a while I could get ...
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1answer
4k views

Boot iMac G5 17 iSight from external USB optical drive?

Is it possible to boot iMac from external USB CD-ROM?
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1answer
565 views

Mac Mini Server running Mountain Lion (10.8.2) is freezing during boot (last line: IPv6 packet filtering initialized)

Starting in verbose mode (Cmd+V), the last line I see on the console is: IPv6 packet filtering initialized, default to accept, logging disabled This happens regardless of having an ethernet cable ...
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1answer
11k views

Stop-sign after boot and “Still waiting for root device”

Need some advice regarding a problem starting up my Mac Mini (mid 2011). The other day I was browsing websites when the machine froze with the spinning beachball. So I was forced to power off/on my ...
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2answers
730 views

Help diagnose errors on MacBook that will not boot

I have a MacBook which won't boot beyond the grey screen / Apple logo. With some key combo (can't remember what I did!) I managed to get a black screen with text output - see image. Can anyone offer ...
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1answer
418 views

MacBook Air dual boot Lion+10.6

Can a 2010 MacBook Air internal SSD be configured for the dual-boot of both Lion/10.7.x and Snow Leopard/10.6.x? If so, how much extra storage space is required for 2 boot partitions vs. one? Other ...
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1answer
689 views

Mac Book Pro 3,1 uneven startup behavior - sometimes start between 5min to 30min after pushing power button

First of all, my Mac Book Pro won't start up after going to sleep mode - all black screen etc. When I choose power down from the menu, well, it doesn't power down completely. The hard drive is still ...
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3answers
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MacBook Pro won't boot into safe mode or from DVD

Specs: MacBook Pro 7,1, 2.4gHz Intel Core 2 Duo, 4GB DDR3 RAM, 500GB HDD with Snow Leopard v10.6.7 I'm having a weird problem. I want to boot from the install disk to run Disk Utility because I'm ...
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1answer
561 views

How can I get boot details when booting from Snow Leopard DVD?

I'm running into a situation where I need to repair my main partition but I can not get my machine to boot off the Snow Leopard DVD. It will boot up, let me choose my language, then go to the "...
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1answer
39 views

MacBook Air 7.1 (early 2015) freezes for five to ten minutes after login

Recently, my MacBook Air 7.1 (early 2015) has been very slow on startup. That is, the system boots quickly, and then I'm able to login, and the desktop begins to load. Initially, I have control and ...
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2answers
198 views

MacBook Air not booting, Boot loader not available, Internet recovery not available

Recently I tried to factory reset my Mid 2012 MacBook Air. In order to do that: I booted into Recovery mode with Command + R. Then navigated to Disk utility and Erased Macintosh HD. Then I restarted ...
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1answer
985 views

Mac asking for username and password on starting up

I am running MacOS High Sierra on a Macbook air and this is the screen that usually comes up on booting. The mac starts up after typing the right password. From yesterday after restarting, after ...
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1answer
145 views

How do I make an external USB bootable?

My main HD has 222GB in use, and is formated OS X 10.10 Yosemite (latest). I am marrried to 10.10, no time to upgrade. I bought a 256GB (244 reported) USB stick (Sandisk midrange, their $56 midrange) ...
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1answer
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Missing Firmware Partition after NVRAM reset in MacOS High Sierra

Maybe someone can help me. Earlier today, I was working on my MBP and it wouldn't read my external flash drive, yet it read it last night before I ejected it. However, today it wouldn't find it. I ...
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1answer
39 views

What is normal for startup chime till Apple logo shows?

My late 2015 iMac recently started taking a very long time to go from the startup chime till the Apple logo appears - about 2.5 minutes. Between the chime and the logo, the screen was black. After ...
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1answer
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A1502 Late 2013 MacBook Pro will not boot, one exception

The ONLY time it's booted since it's been in my possession was when it was in the Apple Store, when it ran the Apple Diagnostics. What I've tried is: resetting the SMC (no reaction) using power on ...
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1answer
553 views

What would be the cleanest method of converting my APFS macOS partition back to HFS+?

After installing High Sierra when it was released, I was initially happy with APFS and gave no care to its relative novelty. Recently I've been using Linux, macOS, and Windows, and having to reboot ...
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2answers
28k views

How do I install and format new hard drive in mid-2012 Macbook pro? [duplicate]

My hard drive in my Macbook completely broke a few weeks ago (didn't have much on it thankfully), so I bought a new hard drive and replaced the old one. Now I'm not too sure how to set this new hard ...
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1answer
2k views

How to Make Bootable APFS Volume From Disk Image

I am currently using terminal to early and quickly add APFS volumes to my Mac's APFS container. Once I make an empty APFS volume in the container, how can I copy a disk image to it and make it ...
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2answers
1k views

Startup Disk full - Read-only- cannot boot Mac Mini

I'm at my wits end with this issue. Hours of searching various forums have produced glimmers of hope, but nothing works. First - mea culpa - I have only myself to blame. Short Version: I wiped my ...
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1answer
599 views

MacBook Pro suddenly does not boot and acts very strange

Suddenly when booting up my MacBook Pro I got the message in the image It restarted by itself a couple of times giving the same crash message. Then it wouldn't boot at all. It would just go black ...
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1answer
50 views

i have a macbook - 2012 and the ssd is full - only 32mb free - i cannot boot up . need to delete files but how?

My 2012 MacBook has a 240gb SSD, will not boot up. I can get into disk utility, and it cannot verify disk or repair disk. I can see that there is only 32mb free. I think this is the problem. If I ...
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1answer
414 views

How can I PXE boot MacOSX 10.11 in virtual box

I'm looking for a way to PXE boot macOS running in VirtualBox so that I can capture an image for fog server. When I restart the OS I can get into the boot options but there are no options to boot from ...
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1answer
371 views

macOS cannot boot. How can I add trailing loader space?

I am running El Capitain on a MacBook Pro and I decided to add a Ubuntu dual boot to the system. To do this I installed rEFInd, partitioned 100GB for the linux file system, partitioned 2GB for the ...
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1answer
1k views

Macbook pro wont boot, Kernel cache read error 0x6

I have recently installed macOS Sierra and sometimes my Macbook pro mid-2012 boots up properly (rarely). Otherwise it does not boot. When I try to boot it with cmd+v , it shows following text: Read ...
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1answer
1k views

Disk I/O errors while reading journal during boot

A few days ago my MacBook crashed after it got hot as it didn't go into hibernate and was stored in a backpack. No damage seems to have occurred apart from my corrupted HDD. After trying to get it out ...
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1answer
2k views

To Rescue Nonbooting OS X with Grub?

I had Refind bootloader in Macbook Air 2013-mid. My disk has OSX and broken Ubuntu. Ubuntu messed up my bootloader such that it starts only. I cannot go to grub/refind by pressing ALT, ALT-R, ... My ...
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1answer
3k 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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1answer
6k views

MBPr with El Capitan freezes at or right after login

Here's the problem: my colleague has a MacBook Pro Retina with El Capitan installed and he's been having issues with regular freezes lately. Everything has worked fine under Mavericks for well over a ...
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1answer
2k views

Accidently deleted some small sized partitions when installing WIndows(Bootcamp). OSX Partition wont boot

I tried to install Windows 8 into my Mac via Bootcamp. I booted into the Windows 8 Installer and had issues formatting the drive that I partitioned for the OS. Like an idiot, I deleted all of the ...
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1answer
9k views

iPad 1 won't boot, flashes apple logo

I have recently acquired a refurbished iPad 1 WiFi + 3G. Straight out of the box it wouldn't boot up at all. No logo, or anything. Upon plugging the device into the AC power charger, the Apple logo ...
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1answer
583 views

Yosemite Startup Manager After Downgrading to Mavericks

I downgraded from Yosemite Public Beta to Mavericks by: Created bootable Mavericks USB Booted Mac to the Mavericks USB Went into Disk Utility > Selected HD and Erased HD Restored to Mavericks Time ...
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1answer
754 views

Modify SATA link speed down (Mac won’t boot)

I have a MacBook Pro (Early 2011, MacBookPro8,2) which I cannot reboot, otherwise I have to reinstall Mavericks every time. Sleep mode works, luckily, but sometimes I need to reboot. In April my HDD ...
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2answers
5k views

OSX Partition won't mount. Permissions seem wrong

OS X was spinning and spinning when trying to shutdown so I held down the the ⌽ Power button to force shutdown. Current Situation: I cannot boot to OS X directly, I first have to boot to single user ...
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1answer
2k views

Unusually long boot time in non-verbose mode - early 2008 MBP + SSD + Mavericks

Inside my early 2008 MBP (15", C2D 2.4, 4GB, GF8600M) I installed a used Samsung SSD (128GB), did a clean Mavericks install and at first startup, I restored the Applications, Desktop, Documents etc. ...