Questions tagged [boot]

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

279 questions with no upvoted or accepted answers
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Is there any way to prevent a MacBook Air (2019) from powering up when an input device (keyboard or trackpad) is touched or the lid is open?

While I know there is a hack to prevent MacBooks — 2016 and higher — from starting up when the lid is open, I would like to know if there is a similar hack to prevent a MacBook from powering up when ...
8
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1answer
5k views

Macbook doesn't display on external screen until after I log in (Yosemite). How to fix?

I have a macbook pro (mid-2011) and an HP Pavilion 22bw (prob inconsequential) connected via a Thunderbolt DVI Adapter. Ever since installing Yosemite, I now need to open the macbook pro and log in ...
4
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0answers
150 views

Deleting a linux dual boot on mac

I have a linux dual boot installed with rEFInd, which I want to delete. I tried to just delete the disk partition, but that throws an error. MediaKit reports partition (map) too small. If you ...
4
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0answers
3k views

What is IOConsoleusers: gIOScreenLockState error during boot?

So yesterday morning I was using my Mac normally encoding some videos in HandBrake and installing some github repo installing some python packages system wide like a python package named b45. Then I ...
4
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0answers
2k views

Whats wrong if 'Invalid BS_jmpBoot in boot block: 000000'

I have a corrupted partition and upon trying to repair it with disk utility it gives the error Invalid BS_jmpBoot in boot block: 000000 Several postings on the internet describe this problem related ...
4
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0answers
76 views

Is my system disk damaged?

Recently I couldn't get my Mac (bought in April - 2009) to boot. The hard disk was quite full and honestly speaking I kept ignoring a number of warnings from OS X to 'free up some space'. I have been ...
4
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0answers
4k views

Creating a bootable Windows USB drive when Bootcamp is already installed

I just upgraded to El Capitan, and am now having issues booting directly into Windows. I need a bootable Windows USB stick to repair my bootcamp partition, but I'm having a difficult time making that ...
4
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0answers
686 views

How to 'startx' from Single User Mode?

I usually run dwm inside Xquartz on OS X Mountain Lion 10.8. But is there a way to boot into Safe Mode (or a console), then startx or xinit, skipping Aqua? I'd like to boot directly into X11.
3
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0answers
3k views

Blinking question mark folder after updating from Mojave to Catalina

I used macOS Mojave on mid-2014 MacBook Pro before update. While installation it forced me to restart. After restart nightmare has been started. The Blinking question mark folder has appeared on my ...
3
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0answers
217 views

T2 chip on 2018 Mac Mini causes booting Mac OS via Refind bug after unplugging power

Recently received new shipment of T2 2018 Mac Minis at work. I had to install the refind boot picker on them. Install is straightforward and successful but for some reason once I unplug the power ...
3
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0answers
374 views

I can't go back to macOS after successfully installing Win 10 from Boot Camp Assistant

I have a iMac running macOS High Sierra. I ran Boot Camp Assistant on it and was able to switch to Win 10, successfully, without any problem. I downloaded the ISO file for Win 10, and used the USB ...
3
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0answers
365 views

Dual boot bootloader problems - Mac & Linux

I recently stumbled upon a problem with default MacOS bootloader. The scenario is next: My Macbook pro 2012 only has one 256 GB drive from where I specified 70 GB's of space to be used as Ext4 ...
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0answers
2k views

Need an external Linux with hardware driver and support for MacBook Pro 2016 or newer

What Linux support hardware drivers for screen / trackpad and optionally all keys? Core requirements: no state changes to the original hard disk (this qualifies it as "external" ) drivers for Apple ...
3
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0answers
394 views

After trying to install Kali Linux I can't access macOS anymore

I've tried to install Kali Linux as dual boot with macOS. I've partitioned 20 GB on the side from 250 GB for that purpose but the installation didn't go as planned. So I decided to reboot macOS and ...
3
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0answers
34 views

Users on boot screen don't refresh

I'm running macOS 10.13 on a MacBook. Users & Groups show me one Current User and a deactivated Guest User: but on the boot screen another user shows up, that I had added and removed a few weeks ...
3
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0answers
763 views

Unable to restore iMac

I am somehow unable to restore my iMac from 2011. Someone gifted me the iMac but had his HDD removed. I thus reinstalled a new HDD. After the chime I press Option+Command+R and the network restore ...
3
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0answers
436 views

How to make a bootable (encrypted) copy in an external drive from a FileVault 2 encrypted boot partition

I configured my MacbookPro (Retina) as follows: /dev/disk0 (GUID partition scheme) EFI 200 MiB Apple CoreStorage 128 GiB <- FileVault 2 encrypted Apple Boot 650 MiB <- ...
3
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0answers
3k views

How to bless a partition using a custom EFI-boot file with non-conforming directory structures and/or file names?

Is there a guide on how to bless a partition for booting, one that doesn't have the default /System/Library/CoreServices/boot.efi structure? For example, I installed GRUB on the default EFI System ...
3
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0answers
62k views

Freeze on boot after installing Yosemite

Sorry for the writing style but I am typing from my smartphone now. My MacBook pro on Mavericks worked like a charm but crazy as I am I decided to install Yosemite without any backup as I am lacking ...
3
votes
0answers
4k views

MacBook does not list my bootable USB stick in the boot menu

I made a bootable USB stick with OSX Lion. When starting up my Mac Mini (which has OSX Mountain Lion installed) while holding option, the USB stick is listed and I can boot from it. But I want to use ...
3
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0answers
694 views

Disable boot from CD/DVD

Is there a way to disable the boot from CD/DVD? I don't want to disable it permanently, just when it automatically checks on boot for the presence of a CD/DVD.
2
votes
1answer
24 views

Keyboard lag, lost keystrokes, and high fan speed in Filevault's EFI pre-boot unlock/login screen (MacBook Pro 2017)

I have a MacBook Pro (15-inch, 2017) with macOS 10.15.4 and FileVault enabled. When I boot the machine, the Filevault's pre-boot unlock screen appears as normal, prompting me for my password. Now, ...
2
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0answers
44 views

Boot from Terminal in Recovery Mode

Laptop: Macbook Pro 2015 with macOS Mojave freshly upgraded from High Sierra and active FileVault. Issue: After Mojave installation I see the prohibit sign and can't boot as usual What I did so far: ...
2
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0answers
35 views

Download failed in recovery mode, stuck with no OS on my Mac

Recently after upgrading to Catalina, my MacBook Pro has become really slow, so I thought it might be the system’s problem, so I decided to reinstall the original system that comes with the Mac (El ...
2
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0answers
15 views

MacBook not booting up nor recognising bootable usb

I have this old macbook that I wanted to convert into a ubuntu server, however it didn't recognise my ubuntu server bootable usb which my newer MacBook Air did. After tying to use a 32 bit version and ...
2
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0answers
86 views

How to create bootable Windows 10 installer USB for PC?

I've downloaded Windows 10 from Microsoft and want to create a bootable USB stick for a PC. I've tried to flash the image with dd, but the stick did not boot. Then I've flashed the image with ...
2
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0answers
38 views

MBP mid 14 won't boot post kernel panic? Frozen on Apple logo

Suspect: Macbook Pro Mid 2014 13" Retina on macOS High Sierra Symptoms: suddenly frozen under normal usage (Chrome browsing), similar to a kernel panic, Shut down by holding the power button. Not ...
2
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0answers
23 views

Recovery Mode can't see new drive but USB installer can

I'm having a lot of difficulty replacing a dead SSD in a 2013 macbook pro. Before the drive died the computer was running a fairly old version of OS X, seemingly Yosemite. I bought an OEM ...
2
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0answers
40 views

How to access ASL (Apple System Log) from macOS Recovery?

I have trouble booting the MacOS system. It's in constant loop. I don't know how can I access the logs from MacOS Recovery so I can troubleshoot it. Any suggestion? Can I do SSH to the system?
2
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0answers
81 views

Replaced SSD won't boot

I have cloned the HDD from an old MBP (Early 2011) to a Kingston A400 SSD. When booting from USB it all works fine, however once installed internally when booting it shows a no entry sign 🚫 (I assume ...
2
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0answers
37 views

Booting into macOS installer; possibly stuck

I'm trying to boot into a macOS Sierra installer that I made today. For the last about 20% of the progress bar, it was booting extremely slowly. Now, the progress bar has been stuck for the last ~20 ...
2
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0answers
116 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-...
2
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0answers
77 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 ...
2
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0answers
114 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 ...
2
votes
0answers
175 views

Macbook Pro OSX 10.11.6 stopped booting

I tried booting my mac today as usual but it turns out that almost immediately the nasty prohibition sign appeared. I tried the usual stuff: resetting PRAM, SMC and nothing. I tried safe mode, but ...
2
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0answers
815 views

SSD RAID card in Mac Pro (Mid 2012) 5,1

question with two parts: Is there any card that has PCIe x4 with AHCI interface (to be bootable on MAC Pro) that takes two M.2 SSD cards? And if teher is does it matter if the SSDs (if the card ...
2
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0answers
842 views

Early 2011 MacBook Pro not booting, damaged firmware?

I have an Early 2011 MacBook Pro (A1286). I upgraded it to macOS High Sierra and I sold it to a friend of mine, who returned it back after few weeks because it stopped booting. It always gets stuck at ...
2
votes
0answers
238 views

Keyboard not working during boot

My Mac keyboard is not working during EFI startup, so I can’t press option to select the boot device. I am dual booting Archlinux, so my EFI binary is from systemd-boot. I configured timeout in loader....
2
votes
0answers
797 views

Macbook Flashing Question Mark backup

I had the unfortunate luck of getting the infamous flashing question mark folder when I booted up my 2012 macbook pro. I have never used timemachine before, so I can't call backups. So i've been ...
2
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0answers
702 views

How to boot 2015 Mac Pro without monitor

I have a mac pro which I and several colleagues access through screen sharing. It has no need of an external monitor itself. Periodically, it shuts down (perhaps because of university-mandated ...
2
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0answers
190 views

Macbook Air Panic on Boot, “Unable to find driver for this platform: \”MacBookAir7,2\"

I have a Macbook Air that isn't booting into macOS. I'm repairing it for a friend, and they said this issue started suddenly for no reason, but I can't be 100% sure. Normally it hangs on the apple ...
2
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0answers
340 views

Unable to boot OS X on external HDD on 1 mac but fine on another. No entry sign

I've managed to reformat and install OS X Sierra on an external hard disk with an USB3.0 connection to a borrowed 2015 Macbook Air. The install was successful and the OS was able to boot and work fine....
2
votes
0answers
80 views

Bootable Sierra SD card that doesn't show up in Startup Disk but does mount in finder

I have a bootable Sierra SD card that doesn't show up in Startup Disk but it does mount in finder. I can boot other MacBooks with that SD card but on this one it will not work. I've also tied to burn ...
2
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0answers
99 views

What process powers the progress bar during initial boot?

I recently learned that launchd was written and used starting with Mac OS X Tiger. Before it's inception the progress bar would actually give useful information about what process was currently being ...
2
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0answers
88 views

Macbook is not starting up / random shut down

I was working on illustrator and suddenly my laptop went off, and is now failing to boot. Random lines are appearing on my screen as it tries to boot. Below is a link to a video I made of the issue: ...
2
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0answers
2k views

Installing Mac OS X 10.3/10.4 from USB

I have a PowerMac G4 (AGP) with a working copy of Mac OS 9.2, and a corrupted copy of OS X 10.3. I would like to either reinstall Panther, or upgrade to Tiger. The catch is that for several reasons I ...
2
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0answers
501 views

MacBook starts to boot but kernel panics before OS loads, works after reinstall until reboot

For the past 2 weeks I've had a problem: my MacBook Pro starts to boot but doesn't load the OS. I think it is a kernel panic. Here is a photo from the verbose boot. The only way to fix it is to ...
2
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0answers
490 views

OSX stuck on boot after switching language

since yesterday my MacBook is stuck on boot after changing language in the systems control panel: Before the login I just see a circular loading indicator and my mouse cursor is stuck in the top left ...
2
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0answers
121 views

Firmware Password isn't the one I entered

So the firmware password isn't the one I entered. To avoid the usual onslaught of insinuations that it 'might not be my computer' that usually accompany questions of this nature, I want to state ...
2
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0answers
6k views

Create a Bootable Windows 7 USB from a Mac

I found several old threads where similar situations were described with no practicable answer, so I ask again. Please forgive me if I am creating a redundant post but I have read the following ...

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