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

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0
votes
1answer
3k views

Yosemite keeps restarting or going into grey screen

I have an iMac from 2011 and I have installed Yosemite as soon as it was released, without any issues before this one. Here is what happened: it has suddenly shut itself off, after turning it on, it ...
2
votes
5answers
23k 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. ...
1
vote
1answer
924 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 ...
1
vote
2answers
4k 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 ...
1
vote
0answers
35 views

Internal SSD not visible

When I boot up my Macbook Air (circa Sept 2013, running Mountain Lion), I get a folder with a "?", indicating the SSD is not visible. This started when I tried installing an Office upgrade, and ...
1
vote
3answers
4k views

How do I restore a Windows 7 DMG file to Boot Camp (and make it bootable)?

My iMac's HD died last week, and so I was unable to access OS X (I had a Time Machine backup of it though). Fortunately I was able to boot into the Recovery HD and use Disk Utility to backup Boot Camp ...
2
votes
1answer
4k views

Login - Screen Flashes and Returns to Login Screen - Tried Everything Possible

I have an absurd issue which pretty much nothing seems to be able to fix - I have a 2011 Macbook Pro running Mavericks. When I try logging into my main account with the correct password, the wheel ...
0
votes
1answer
132 views

Macbook Pro Ram and/or Processor broken?

I am experiencing several problems with my MacBook Pro early 2011. It all started about two months ago with my wifi card. It lost connection to the network every few hours. The symbol in the status ...
-1
votes
1answer
69 views

Can I move a hard drive from a MacBook 13 to a MacBook 15?

I'm thinking of upgrading my machine to a 15" and wondering if I can just move the hard drive over and put a new one in the 13"? The reason is my 13" Macbook has a 2TB HDD and I'd rather keep that ...
0
votes
2answers
634 views

MacBook Pro doesnt boot after systemupdate / repairing volume doesnt work

i have a problem with my MacBook Pro. I installed a Systemupdate, reboot and then i had a loading screen which loads a long time. Then i started the mac in verbose mode and there is... hfs: mounted ...
1
vote
1answer
261 views

MacBook Pro only boots to grey Apple screen with spinning loader

My MacBook Pro boots to the hated gray screen. Things I have tried to fix this include: Booting with CMD-R (boots to a grey screen) Resetting the PRAM (boots to a grey screen) Resetting SMC (boots ...
1
vote
2answers
124 views

unable to boot my iMac

Recently, I attempted to re-install Mac OS X Lion on my 2007 iMac computer (EMC 2133), but during the installation process it got interrupted. After rebooting it just displays a blank grey screen ...
1
vote
0answers
258 views

Macbook Pro formatted with windows, now can't install OS X or Windows!

I formatted my MacBook Pro Mid 2010 with Windows, now I can't install any operating systems on it. I tried to install Windows 8.1 on my MacBook, then at the final step I received a message saying ...
2
votes
0answers
848 views

MacBook Pro will boot only after a SMC reset

I replaced the hard drive in my MacBook Pro (mid-2010) with a SSD one. I installed Mac OS X 10.9. At first the installer wasn't able to find the new SSD drive, because of a error: "SerialATAPI device ...
0
votes
0answers
222 views

Macbook Pro doesn't boot with replacement battery. 15 inch late 2011

I bought this replacement battery for my 15 inch Macbook Pro late 2011: http://www.amazon.ca/dp/B00OD7OHLY/ref=sr_ph?ie=UTF8&qid=1419964742&sr=1&keywords=macbook+pro+late+2011+battery ...
10
votes
4answers
42k views

How do I make a bootable USB flash drive for a MacBook Air?

Does anyone have a Terminal command-line recipe for making a new bootable USB flash drive for one of the new MacBook Air's? Is there a way to dd copy the USB boot device that comes in the box and ...
1
vote
4answers
21k views

Lion hangs on boot with empty progress bar and then switches off

Today as I was working on my MacBook Pro, it became incredibly slow and almost impossible to work with. I spent five minutes trying to restart it from the system menu, and eventually I did. It took ...
1
vote
2answers
644 views

How to install Windows 8 on an early 2006 MacBook?

I have recently obtained a MacBook 1,1 from my older sister and it happens to be quite old. I have attempted to revive it with boot camp but my windows installation is stored on a USB drive instead of ...
1
vote
0answers
11 views

securing boot process against port access but not full physical access

Is it possible to secure a Mac Mini (2014) for use in an scenario where users have access to the ports but not full physical access to the computer's internals? I need to be able to disable cd boot, ...
0
votes
0answers
103 views

BootcacheControl.playlist not found, MacBook does not boot anymore

Booting a MacBook with Snow Leopard installed will suddenly stop with the message: Unable to open /var/db/BootCache.playlist: 2 No such file or directory Booting in single-user mode, I can see ...
1
vote
3answers
517 views

Boot on USB from a previous version of OSX

I own a mid-2013 Macbook Air running Mavericks and wish to boot on a USB stick containing a bootable version of DiskWarrior. The problem is DiskWarrior wasn't updated for quite some time and, though ...
1
vote
2answers
243 views

OS X takes long to boot after starting rEFInd once

I have an SSD in my MacBook (Pro 9,2; encrypted), and until recently, the apple icon appeared almost immediately after pressing the power button. Soon after that I would be able to unlock the disk ...
2
votes
0answers
86 views

Can I keep my Boot Camp partition when moving to a larger hard drive?

I just bought a 512 GB hard drive to replace my 250 GB hard drive, which currently has a Boot Camp partition (pretty vanilla, just running a standard Windows 7 install). I was planning to just clone ...
0
votes
0answers
410 views

Drive name red in Disk Utility: Core Storage Drive offline. How to bring back?

Yesterday, my mac wouldn't boot up. When I restarted, I could get the whole way to the User login screen. No matter what user I chose, the boot bar would get about 1/3 way finished and I would get ...
0
votes
1answer
318 views

How do I change permissions of folders on a hard drive from a booted USB drive

I am trying to save my files on my Hard Drive that has a crashed OS. I created a Bootable USB with Ubuntu and successfully booted. I can see my folders, but I can't actually open them because I don't ...
2
votes
1answer
474 views

How can I clear the kernel extension caches while using FileVault 2?

I have the same problem as this user, Air + Lion : plug in USB, keyboard/pad stop working , where the built-in keyboard and trackpad on my MacBook Pro stop working (and drop out of the USB devices ...
0
votes
2answers
24 views

Mac runs same vm. Cannot exit

I have inherited some Mac-based machine, but when I power it on - virtual machine with Windows XP starts. I cannot figure, how to exit this mode or restore Mac to factory defaults. I tried booting ...
1
vote
1answer
115 views

What font is used to print a verbose mode boot?

When booting OS X in verbose mode (⌘V), the log is printed on screen. It seems different to the kernel font, but it might just be a smaller version of it. inverted screenshot Yosemite 10.10.1 ...
0
votes
0answers
21 views

Can I list netboot servers using bless?

At work I'm constantly checking people's computers and needing to netboot to different installers and OS'. Is there a way for me to use the 'bless -netboot' command and list the servers that are ...
0
votes
1answer
127 views

Macbook White Mid 2007 will not boot even on Mac OS X Lion bootup USB

I see the gray screen and nothing shows up for minutes on the screen not even the blinking question marked folder. Does anyone know how to get it to boot as I have a new hard drive I installed and ...
0
votes
1answer
2k views

Yosemite freeze at boot - no safe boot + I/O error

Yesterday everything was fine but today my macbook freeze/stuck during the boot. I've done this: check + repair permission (nothing changed) check + repair disk (nothing changed) tried safemode ...
6
votes
4answers
25k views

How do I make my 1.5 GHz PowerBook G4 boot from a USB stick?

I actually want to boot Linux but since that is not working I'm thinking some one might know on the Apple end. If there's a way to boot Mac from a USB stick, then booting another operating system ...
3
votes
3answers
47k views

Gray screen after installing Yosemite

Yesterday I updated my 2012 MacBook Air to Yosemite. Everything was good, everything working great, but, at the end of the night, my laptop’s battery was low so I decided to shut it down, instead of ...
0
votes
1answer
1k views

How to exit Recovery Mode on jailbroken iPhone

What I've searched so far says that my iPhone had goes to Recovery-Mode (Am I right?) because it stuck on Apple Logo and won't start. What I've tried so far : What is Soft DFU mode, and how do I ...
2
votes
0answers
73 views

MacBook Internet Recovery “?” Folder

With my 2012 MacBook Pro, I'm trying to reinstall Mac OS X (any version that will work) onto a new Solid State Drive that replaced a broken one. I can get to the Internet Recovery screen just fine ...
1
vote
1answer
245 views

Firmware settings

I want to open the firmware settings. I have a Mac book Pro end 2011 and yosemite. When i press Option+Cmd+O+F while booting nothing happens, it continues to boot. What do i have to do? Background: ...
2
votes
1answer
45 views

Is there any way to not boot Finder at startup?

Is there a way in OS X to change the desktop from Finder to something else (for example KDE from Fink)? Basically, I want Finder to not boot up at startup, so no icons, no dock (but keep the menu ...
0
votes
1answer
47 views

Hard drive renamed after restart, apps can't see it

I shutdown my computer when I left work and when I got home turned it back on. When it booted back up the second drive (in the dvd drive bay) had a strange name like A[]\tr/sj or something like that. ...
8
votes
4answers
25k views

Boot hangs on grey screen (even when booting from USB drive with fresh OS X install)

My MacBook Pro 15" Late 2011 (MacBookPro8,2) with AMD Radeon 6770M exhibited display corruption and associated system crashes/resets over a period of two weeks before it entirely failed to boot. The ...
2
votes
3answers
10k views

Boot from USB on MacBook 1.1 (early 2007)

I’m trying to install Windows 8 from USB on my MacBook 1.1 (early 2007). I have tried booting using rEFIt (on 10.6): Partition my USB key as MBR: the Windows 8 logo fish stays stuck forever. ...
0
votes
1answer
535 views

Yosemite Grey Screen with 3d Party SSD not a trim issue

I have a MacBook 7,1 which i recently installed a PNY 250 SSD and added some RAM. The laptop was running awesome with OSX 10.6.8, lightning fast. Then I installed Yosemite. There was a bit of hang ...
0
votes
0answers
135 views

Mac with newer OS X installed no longer boots previous version

First of all I am aware of the fact, that Macs usually refuse to boot or install older version of OS X than they were shipped with. But this is not the case here. The long story: A few months ago I ...
2
votes
3answers
7k views

Panic on boot, need to use single user mode (was: need to rebuild kext cache)

I'm getting this at every boot on one Mac: With some searching and asking around I've found that I can get a successful boot if I boot into single-user mode, mount / as read/write, and then do ...
0
votes
0answers
43 views

2011 Macbook pro - i7 750gb screen flicker

My mac did not boot after trying everything. I was planning to replace HDD but before that I took the HDD out and made it external and I could read everything without any issues. So thought its not ...
5
votes
4answers
4k views

Is it possible to install an old version of Mac OS on a new Mac?

I know that Apple doesn't want me to run a version of Mac OS older than the one my Mac came with, but is there a way around this? For example: if I buy a new Retina MacBook Pro, is there a way to run ...
0
votes
1answer
66 views

Can the MacBook boot from a second HDD

If I was to install a SSD in my MacBook Pro (Mid 12) where currently the Superdrive is attached and continue to use the preinstalled HDD for other files, can I run OSX from that new drive? Or in ...
17
votes
5answers
98k views

How to install OSX Mavericks in VirtualBox

I have been trying to use Hackboot to install OSX Mavericks in VirtualBox, and using an ISO image created by following the steps at How to create bootable ISO for OS X Mavericks The steps I have ...
0
votes
2answers
494 views

MacBook Pro stuck on white screen after dual-boot adjustments

I wanted to have dual-boot setup on my MacBook Pro. So after searching for a bit, I found a couple of sites that offered a step-by-step explanation on how to do it using rEFInd. I successfully ...
0
votes
0answers
192 views

Mac mini early 2014: Enter startup manager using a windows (wireless USB) keyboard

Cannot enter startup manager or perform any other startup action on my mac mini. I tried installing Windows 10 (Tech Preview) alongside Yosemite. The mac mini automatically starts into Windows, ...
4
votes
2answers
265 views

Mac boot menu not showing up with different keyboards

I have a Macbook White from 2010. I have been using it for a while and everything works except the internal keyboard which is broken because of a tea spill. An external PC-keyboard (USB) is attached ...