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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USB boot on mid 2010 Intel Mac mini

I have a mid 2010 Mac mini. I recently did an SSD upgrade in it. I tried using Internet Recovery to reinstall Mac OS X Lion (after which I am planning to upgrade further). However, the setup never ...
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92 views

unexpected reboot then unable to boot

Model Name: MacBook Pro Model Identifier: MacBookPro10,1 Processor Name: Intel Core i7 Processor Speed: 2.3 GHz Number of Processors: 1 Total Number of Cores: 4 L2 Cache (per ...
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39 views

why wont my macbook pro mount my disc

I have been using my macbook pro since 2013. Around early 2017 I got a 275gb crucial ssd and installed it. It was working fine until about a month ago my macbook would no longer turn on. Took it to ...
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1answer
327 views

I can no longer boot into macOS after resizing my bootcamp partition in EaseUS

I tried to enlarge the bootcamp windows 10 partition by 17gb. I went to disk utility on my mac, resized the mac's partition to smaller leaving 17-18gb of free space, then booted up the windows in ...
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391 views

Can't boot to Mac OS volume after Bootcamp Windows install

I've installed Windows 10 with Bootcamp on a new iMac with Mojave. Now I can't boot to MacOS volume. 1) Bootcamp tool in Windows don't see volume as bootable. 2) Option click on restart don't show ...
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246 views

Mojave requires OS reinstall on restart or power on. MACH Reboot type 14 = page fault. Screenshot

SPECS: Computer: MacBook Pro (Retina, 15-inch, Mid 2014) MacBookPro11,3. Memory: 16 GB 1600 MHz DDR3 HD: 1 TB APPLE SSD SM1024F Apple_APFS GRAPHICS: NVIDIA GeForce GT 750M 2048 MB Intel Iris Pro ...
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120 views

Cannot boot APFS Volume after time machine restore

First time i've seen this, but had a kernel panic from an installation, so booted into recovery, did a time machine restore. The log says it completed successfully, but upon boot I get the message: "...
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1answer
1k views

kernel panic – MacBook Pro 2011 won't boot, keeps restarting

My MacBook Pro 17" Late 2011 is suddenly unable to boot, keeps restarting over and over again, like 10-20 times until it decides to shut down. As it restarts each time, it displays a message like this ...
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103 views

Boot Partition suddenly inaccessible

I've run into quite a problem - my Mac (mid 2015 21.5" 4k iMac, running Mojave) cant find my boot partition (disk0s2). I've made some headway, it previously just showed it as FFFFFFFF-FFFF-FFFF-FFFF-...
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2answers
602 views

Mojave 59 second hang

About two weeks ago, my Mac started hanging on boot. It has been driving me crazy. Today I looked at the logs in /var/logs/system.log and on every boot I can see a 59 - 60 second hang, exactly. And ...
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528 views

Unexpected shut downs on MacBook Air '15 with code -128

I have a MacBook Air, Early 2015, running macOS Mojave. Over the last 2 weeks, it has been unexpectedly shutting down and rebooting over varied time periods. Upon checking the shutdown logs, I found ...
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1answer
283 views

Installed refind to a separate HFS+ partition alongside macOS 10.14, but can't set it as the startup disk

I use refind as my boot manager on my 2015 MacBook Air. Originally I had it installed on to my internal drive's EFI partition (and installed it in the recovery environment) but every time I update ...
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1answer
938 views

Bless error when installing rEFInd

I am trying to install rEFInd on my MacBook Pro 2018 laptop with the new T2 chip that adds extra boot security. I have both used APFS and MacOS Extended (Journaled). I have also disabled secure boot ...
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61 views

Which NetBoot Server Am I Booted From?

Is there a way I can tell which NetBoot server a client machine has booted off of, from within the client machine itself? This is kind of an obscure question, but I am in an environment that has two ...
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1answer
14k views

Can't start Mac in recovery mode - only get folder with question mark instead

I can't start my MacBook Pro 2017 using controlR, controloptionR, or shiftcontroloptionR. For all combinations I only get the folder with a question mark shown. What can it mean and how can I fix ...
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1answer
173 views

macOS Mojave Installation

I have downloaded macOS Mojave from some other website due to Mac App Store download problem. So now I have to boot the installation file, to do so the help box of the website says I have to press and ...
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58 views

Trouble rebooting from Mojave to High Sierra

I have High Sierra installed on a partition of my MacBook Pro’s internal SSD, and Mojave installed on a partition of an external drive. If I have selected the High Sierra boot volume in Startup Disk ...
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195 views

Possible to boot Mac Pro from two PCIe M.2 AHCI PCIe SSD in RAID 0 on macOS High Sierra?

I have an M.2 AHCI PCIe SSD and I am considering purchasing a second one to install both in a 2009 Mac Pro in a RAID 0 configuration using Disk Utility similar to the setup in this video. I have used ...
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1answer
42 views

Mac Mini 1TB HDD being 100% full - cant mount, cant boot

I just unburied an old 2007 Mac Mini Server which I had put a 1TB drive into. I had kinda forgotten why it broke, but after a while I remembered...the hard way. That Mac's hard drive is so full and ...
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64 views

rEFInd - can boot to Mac Recovery or Ubuntu, but shuts down after loading bar for MacOS

I have rEFInd installed on my 2015 rMBP - I can access the boot menu for rEFInd (although sometimes this doesn't appear / runs very slowly), and all the right options are there, but when I select ...
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1answer
89 views

MacBook Pro not booting

I have a mid 2010 MacBook Pro that won't boot up. Faced this problem quite a while ago, so i sent it in for repair and was told the logic board may need replacement. The store told me they tested my ...
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1answer
671 views

Unwanted GRUB on macOS High Sierra

While installing Linux Mint 19 to a USB, I managed to get GRUB installed on my Mac hard drive. I can still boot to the macOS if I hold the Option key down. How can I remove GRUB and revert my Mac ...
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1answer
54 views

Getting a 🚫 sometimes on boot

On a Mac mini end 2009, with a drive updated to a SSD, and RAM updated to 8GB running OS X 10.11.6, I sometimes get a "🚫" on boot. It then boots in Recovery mode by itself, so i shut it down and ...
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140 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
43 views

Every time I turn on macbook pro I get menu for choosing startup disk

Every time when I turn on my macbook pro mid 2014 I have to choose my startup disk to continue with booting. It behaves as if I am holding the option key... However, the right option key doesnt work ...
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1answer
293 views

Does resetting NVRAM reset EFI Boot Order?

I've had a Macbook Pro for a year or so now and have experimented with quite a few Linux distributions which have added and changed things in the EFI Boot Order. I am looking to clean things up. The ...
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133 views

Boot partition missing:

My 2010 Mac Mini (High Sierra 10.13 and upgraded 500GB Intel SSD 840 EVO) won't boot into the mac side. I bootcamped it several years ago with a copy of Windows 7. It can still boot into the Windows ...
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91 views

Option to boot into Windows missing after Boot Camp Assist

I just completed installing Windows using Bootcamp Assist. I allocated 30 GB to the Windows partition. The process completed after taking a long time (> 7 hours), and a Bootcamp partition has been ...
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1answer
2k views

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
2k views

How to stop mac from default booting in deleted windows via boot camp?

I bountied this question Boot into Mac from Windows after failed Bootcamp after being trapped in Windows hell on my mac, after the first time using boot camp. When I got back to my mac I erased ...
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1answer
805 views

Can't enter Apple Hardware Test Mode on my macbook pro

I have an Early 2011 MacBook Pro. When I hold down D immediately after restart, it boots to the normal login screen. When I hold down ALT+D (with a working wifi connection before the reboot) the same ...
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2answers
84 views

How To Let My MBP know that a USB is bootable?

I have got Unetbootin and have put the files onto my drive which is properly formatted as MS-DOS(FAT) and GUID. I have several folders and files: [BOOT], boot, casper, dists, EFI, install, isolinux, ...
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3answers
320 views

Boot into Mac OS X Snow Leopard 10.6 on a 2015 MacBook Air

I have an external SSD containing a bootable installation of Mac OS X Snow Leopard 10.6. It also contain some software crucial to my use. Can I boot into it using my 2015 13" MacBook Air?
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1answer
13k views

My Mac repeatedly beeps three times on startup. What does this mean?

When I try to boot my Mac I get nothing but strange beeps. They beep as follows: BEEP BEEP BEEP [3 second pause] BEEP BEEP BEEP [3 second pause] and it continues until I power off. So far, I have: ...
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2answers
185 views

Boot Camp keeps booting to Ubuntu instead of Windows

I have a macos and Windows 10 already installed. I went ahead and installed ubuntu via EFI, and I think I really messed something up. Every time I boot and select Windows it goes to the purple ...
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1answer
2k views

How to upgrade boot rom firmware without an original drive

I have a 2015 MacBook pro that I am in the process of refurbishing. I purchased it used and it was missing many parts (wifi card, IO board, SSD). I have replaced all of these parts and purchased an ...
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1answer
459 views

2016 MacBook Pro won't get past the Login Screen

My laptop running 10.13.6, has been working great without any issues until I restarted it on Monday. After I logged in, it got stuck on the loading screen and displaying a loading icon for over an ...
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1answer
140 views

Black console screen shows up during boot (verbose mode not turned on)

Over the past few months when my Mac boots up, the grey screen with the apple disappears and is replaced with a unix style console screen, which scrolls like a linux PC booting up. I have tried ...
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2answers
50 views

Does booting a 2015 iMac from an external disk require “touching” the internal disk?

The hard drive (a Fusion Drive) on my 2015 iMac has become badly corrupted, possibly getting into that state via some incompatible ram that had previous been installed in it. (The ram was removed and ...
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1answer
677 views

Boot Camp Assistant stuck on creating partition due to EFI formatted as NTFS

Boot Camp Assistant is stuck on ‘create a partition’. I have followed the guide as answered in the question Boot Camp Assistance is stuck on create a partition? but it didn't work after step 8. After ...
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1answer
1k views

rEFInd is not working in macos high sierra 10.13.6 on 2018 MacBook Pro 13 inch even after proper installation

I have installed rEFInd in my mac by going into recovery mode -> open terminal -> csrutil disable -> cd "/Volumes/Macintosh HD/Users/username/Downloads/refind-bin-0.11.2" -> bash ./refind-install -> ...
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1answer
343 views

Missing Operating System

So I recently made a post about my Mac not recognizing USB's or Boot. here's the link : MacBook Wont Boot or Recognize USB. Anyway this is an update. So my 2009 MacBook is still not working. It doesnt ...
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59 views

how can I troubleshoot a long “hang” during boot?

Since I reinstalled OS X 10.13.6 on my MacBook Pro (mid-2015, 2.8 Ghz, 1TB SSD), I've noticed that when it gets to about 4/5 of the way through the boot sequence, the progress bar stops for at least ...
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1answer
316 views

How can I reinstall Mac OS 9 on a G3 PowerBook's original hard drive?

I have a PowerBook G3 from 2000 or so and would like to put Mac OS 9 on it for nostalgia reasons. There are games that simply don't perform well with SheepShaver, plus networking with SheepShaver isn'...
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2answers
1k views

Jetdrive 850 install on Macbook Pro 2015

I have a Macbook Pro 2015 that I bought used. When I bought it, OS 10.13 (High Sierra) was installed, but the SSD was failing. I bought a JetDrive 850 to replace it, and put the High Sierra installer ...
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1answer
16 views

How do you boot verbosely when booting off an alternate device?

I've got a problem where boot is failing when booting off a USB stick. So, I hold option down to choose the USB stick, but if I immediately hold down command-V after, it still boots with plain grey ...
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2answers
2k views

Macbook Pro Won't Boot off of USB Flash Drive

Model MacBook Pro 2010 6,2 OS X version Yosemite 10.10.3 I used createinstallmedia to format and create an install USB stick. This step went fine. Command used was: /Applications/Install\ OS\ X\ ...
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32 views

MacBook Air 2013 rebooting when waking up from standby

I recently started having this problem with my MacBook Air 2013 (i7/8GB) running the latest High Sierra: Sleep itself works perfectly fine. If I wake up the device within the standbydelay of 3 hours, ...
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108 views

MacBook Pro Mid 2009 shows forbidden sign but boots when holding command key

After upgrading from High Sierra 10.13.x (can't remember) to High Sierra 10.13.6, something went wrong with the boot partition. When turned on the MacBook shows the forbidden sign. However when I ...
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1answer
38 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 ...