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

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1
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1answer
829 views

Macbook Pro 13' Late 2011 didn't see Samsung 850 Evo SSD on boot

I'm trying to update hard drive in my Macbook to the new SSD one. Notebook model: Macbook Pro 13' Late 2011. SSD model: Samsung 850 Evo 250Gb. Then I connect SSD thought USB adapter notebook can see ...
0
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0answers
41 views

Reset MacBook Pro Boot Location

I logged into my friend's MacBook Pro 13 as Guest User to install OS X Yosemite on a USB flashdrive. I downloaded the Installer from the Mac App Store and stored it somewhere within the Guest User's ...
4
votes
1answer
505 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 ...
1
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0answers
89 views

Mac Mini and Wide (21:9) Monitor / Display Port Issue

When I boot up my Mac Mini after moving it from my office at work where it worked with my wide (21:9) monitor to my house, when I boot it the display does not show up on the monitor anymore. Waits ...
5
votes
4answers
23k views

What can be done to fix a 2011 iMac that will not boot past the white screen?

I have now tried opening the iMac and removing the cables to the SSD, it still gets stuck on the white screen. I tried again, removing the cables to the HDD as well and the same thing occurs. No idea ...
0
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0answers
29 views

Grey screen on an apple

I have an old imac machine. I've tried doing a single user mode boot. Nothing. I tried doing a PRAM/NVRAM reset did not happen. There was no second restart. I also tried booting to a USB drive, ...
0
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2answers
18k views

No bootable device found ( Install windows on Mac )

I'm owning a macbook pro 13 inch mid 2009 and a USB thumb drive Kingston DataTraveler 100G3 16 GB. I successfully installed Windows 7 on my Mac using Bootcamp ( with a little trick to enable "Creat a ...
1
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0answers
172 views

Apple Macbook MB467LL/A gray screen no apple logo HELP please

New to the site, and I am having a little problem. My wife's Macbook has me stumped. It was working fine, (running Mavericks) and then just powered off. On powering back on we are now treated to a ...
0
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0answers
103 views

Screen goes grey when doing Internet Recovery on MacBook Pro

I have been experiencing a problem with my MacBook Pro that seems to be quite unique since I've spent hours trying to find someone with the same problem and found none. I have a MacBook Pro, late ...
1
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0answers
289 views

MBP 15 2014 unexpectedly shuts down after startup/login

MacBook Pro 15, Mid 2014, Yosemite + Windows 7 (Bootcamp) This problem started today after waking up. Yesterday night I had no problem whatsoever with my computer. After turning it on and logging in ...
0
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2answers
108 views

Boot MacBook Pro from USB stick

Concerning a MacBook Pro with Snow Leopard. As you know when pressing alt during startup there is the possibility of selecting which disc/drive/memory you want to boot from. For example if you have a ...
0
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1answer
206 views

Mac pro early 2008 won´t boot from pendrive with yosemite install app

Mac pro 8 core early 2008 mountain lion installed. I need to clean install Yosemite. The pendrive does not show when you press alt, at the boot screen. Nevertheless it shows on configuration startup ...
0
votes
1answer
71 views

Is it safe for Mac not to sleep for over a month

My 17 Inch, Late 2011 MacbookPro has a problem with its discrete graphic card it boots with vertical pink stripes screen then switches to a gray screen where it remains stuck for a while and then ...
0
votes
1answer
244 views

How to change boot picture of Windows partition?

On a MacBook with Bootcamp installed, I got three partitions: OS X 10.10 Windows 10 OS X Recovery On boot, with 'alt' key down, I get the bootloader and I can choose which partition to boot. On ...
0
votes
2answers
612 views

Can't boot on OS X partition after resizing Windows partition

I initially had three bootable partitions: OS X Recovery for OS X Bootcamp (Windows 8) Now, on Windows, I decided to make my Windows partition smaller, reducing its size using the native Disk ...
0
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2answers
673 views

My whole HD is “Mac OS X Base System”

my entire HD is now "Mac OS X Base System": ps: Mac OS X Base System is Disk0s2 I cant delete this partition to install Mac OS X; I already try the terminal, but message reply "you cannot erase ...
0
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0answers
167 views

Sound not working on new Windows 8.1 install (Early 2011 MacBook Pro)

Background: My CD/DVD drive is broken so I had to install Windows from a USB drive. I used a trick that involved changing entries in an info.plist file belonging to Boot Camp Assistant which allowed ...
3
votes
1answer
394 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 ...
0
votes
2answers
73 views

Mac book doesn't boot

My Mac book pro 13.3 inch retina display August 2014, did not boot after a normal shut down. It gave sound on power on but after stays grey. I tried all options available on net CMD+C, C, SHIFT+CMD+V ...
1
vote
1answer
89 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 ...
2
votes
2answers
366 views

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 ...
0
votes
0answers
53 views

New drive won't boot internally

So I purchased a new 2TB drive (Samsung model #ST2000LM003) for my 13" MacBook Pro. No issues with the old one, just getting close to capacity. I connected it with a SATA/USB adapter, formatted it, ...
0
votes
0answers
72 views

System restore: an error occurred while preparing the installation

I bought a used mac mini on ebay, the guy who sent it to me completely formatted it, leaving only recovery partition. Now when I boot the recover, I see 4 options, one of them is reinstall the OS. ...
0
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0answers
29 views

MBA with Syslinux on USB

I'm trying to boot a Linux kernel built with Buildroot from USB on my Yosemite Macbook Air. I have followed the first steps in Failed To Install syslinux on USBDRIVE with Mac OS X, i.e. - DiskUtility ...
2
votes
1answer
120 views

Is a bootable USB drive with Yosemite OK for different macs?

This might be obvious, but probably worth a question: I took my MBP (Early 2011 15"), downloaded Yosemite and created a bootable USB device from which I later clean-installed the OS. Can I use this ...
0
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1answer
51 views

Unable to properly boot Power Mac G5 running Debian without a screen connected

I’ve got Power Mac G5 running Debian 6 in headless mode as a media/home server. When booting it without an attached screen, the fans ramp up from the idle speed to maximum over a couple of minutes. ...
1
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0answers
32 views

MacBook Air boots into wrong partition

I have two partitions created, one called "Yosemite" and the other is my default 10.6.8 partition "Macintosh HD". I successfully installed Yosemite onto the "Yosemite" partition, but when I try and ...
1
vote
2answers
6k views

Yosemite won't boot in safe mode with Shift held down

I'm investigating some slowness with my late '13 rMBP which I upgraded to Yosemite on Sunday. Problem is, I can't boot into safe mode by holding the Shift when restarting or powering up. I tried ...
3
votes
2answers
4k 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 ...
3
votes
1answer
49k views

Can't start up MacBook Pro from OS X install discs

I wanted to re-install my mid-2010 15-inch MacBook Pro (Intel Core i7 2.66 gHz 8 GB 1067 MHz DDR3 RAM) which is currently running Mac OS X 10.6.8. I inserted the retail Mac OS X 10.6 install disc, ...
0
votes
1answer
51 views

2007 iMac Blured Screen of Death

I'm running OS X 10.10.1 on a 2007 iMac (Intel based) I have tried to boot into the recovery HD, but it just continues with the boot as if I have never pressed cmd-r. When it does finally boot; it ...
4
votes
4answers
154 views

Mac Won't Boot. Help needed

I use top-notch MBPRO15 Late 2011 with the latest OSX and all the recent updates installed. I had booting problems before which I managed to solve through command+option+P+R. I'm not sure what exactly ...
0
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0answers
203 views

MacBook Pro won’t boot up after putting the bottom case screws back in place

I'm kind new in this world of Apple, and I have an Intel-based Mac that suddenly had the hard drive fail. So I make a Mac OS X USB flash drive, and realize that the old hard drive died since “Disk ...
1
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0answers
574 views

Yosemite displaying the blue and grey screen of death

I have a late model 2011 MacBook Pro, and I upgraded to Yosemite two weeks ago. Yesterday I was working in After Effects on some pretty big movie files when the laptop screen just went black. Now ...
-1
votes
1answer
82 views

Key to boot from USB on Ubuntu MacBook Air

Recently, I removed OS X from my MacBook Air and installed Ubuntu 14.04 on it. I have been trying to install Debian during last week, but I don't have idea what's the key to enter into 'BIOS boot ...
1
vote
1answer
84 views

Fix formatted GPT in SSD

I accidentally formatted my SSD's GPT while formatting a USB in Linux's gparted. Now, when running gpt in Mac's command line, this is how my SSD looks like: My-MacBook-Pro:~ user$ sudo gpt -r show ...
0
votes
2answers
899 views

Create a bootable USB with Windows installer for Yosemite?

I'm having trouble creating a bootable USB for my mac. I have an iMac, and I'm wanting to install a copy of Windows Server 2008 x86 onto it. I've tried BootCamp, but I'm getting errors when selecting ...
0
votes
1answer
62 views

Why don't Windows 7 bootable sticks start on MacBook?

On Macbook air ~2014 when I created the bootcamp partition and the Windows bootable stick, it made a stick that can start an install just fine on Windows computers. Why doesn't that bootable stick ...
1
vote
2answers
2k 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 ...
2
votes
3answers
6k views

Yosemite OSX iMac reboot progress bar stuck at 50%

My son went out of town and, upon returning, turned on his iMac. It rebooted and went into the progress bar typically showing during updates. It goes to the 50% mark, fairly quickly but then stayed ...
0
votes
2answers
185 views

Can I boot OS X or Windows Boot Camp from an external USB Type-C drive?

Currently I boot OS X and Windows Boot Camp from an external Thunderbolt HDD. LaCie just announced a new external USB-C (USB 3.1) hard drive enclosure. Will I be able to boot OS X or Windows Boot Camp ...
1
vote
3answers
471 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 ...
8
votes
2answers
3k views

How to disable single-user boot (command S)

By default, Macs are extremely insecure if somebody can get physical access, as they can simply shut it down, press the power button, hold command-S, and there, they get root access in 5 seconds. Is ...
1
vote
1answer
3k views

Dual boot Ubuntu 14.04 on a MacBook Pro

so after a few hours of Google searching and too many headaches with a broken GPT, I've turned here. I have a 2012 MacBook Pro (9,2) that I want to dualboot OS X 10.9 and Ubuntu 14.04 on. I've read ...
7
votes
3answers
8k views

Boot screen has wrong display resolution

I recently used my MacBook Pro (OS X 10.8.4) with a projector using a mini display port to VGA adapter. The resolution of the screen was modified from the use of the projector from 1680x1050 to ...
2
votes
2answers
564 views

Stop sign at boot - new SSD

I've got a mid 2012 MBP 13" in which I inserted a brand new MX100 in the place of the old HDD. I've put the old HDD in a case in the superdrive place and tried to install 10.10 but the install failed. ...
2
votes
1answer
34 views

Can I make a bootable drive for mid 2010 MBP with a Windows computer?

I have a mid 2010 Macbook Pro running Yosemite that I foolishly did a reset on while it was connected to an external monitor that was designated as default in settings And connected to a USB keyboard ...
0
votes
2answers
4k views

Macbook Pro 13-inch stuck at Gray screen with apple logo and wheel

I have a 13 inch Macbook Pro, early 2011 with its original OS. I came to a point where its battery needs to be replaced, and I can't use it without using its charger/adapter. One time, I accidentally ...
0
votes
0answers
115 views

Power Mac G5 doesn't boot/black screen

I have a Power Mac G5 (Model No: A1047 EMC 1969C). My problem is that it doesn't properly boot anymore when powered up. When I'll press the power button, the white LED next to the button will ...
6
votes
4answers
16k views

Can you boot a MacBook Air from a USB 3 external hard drive?

Macs have long been able to boot from external FireWire hard drives. I don’t think they’ve been able to boot from external USB 2 drives though. The new MacBook Air (2012) has USB 3.0. Can it boot ...