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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0answers
144 views

Need to clean install Yosemite without knowing or resetting password

I have a laptop that I would like to get in working order. There are 2 main issues: I forgot the password. When I boot the laptop, I am seeing the flashing folder with a question mark which ...
2
votes
6answers
3k views

My mac has 64-bit EFI, but it only boots with 32-bit kernel

I followed the guide at http://macperformanceguide.com/SnowLeopard-64bit.html to boot into 64-bit mode. I had no problems with the instructions and on the boot screen it says "PAE enabled, 64bit mode ...
0
votes
1answer
108 views

OSX Yosemite won't show desktop

So I got some freeze issue and beach ball indicator was appeared for me. So I was watching rotation of it during ten minutes and then hard reset my mac. So did because I can't click any buttons or ...
0
votes
0answers
454 views

Single User Mode not starting

First of all, there's no firmware password or anything fancy. I'm trying to diagnose a late-2011 MacBook Pro 15", and I'm trying to get into the single user mode. I press and hold Cmd+S (the left Cmd, ...
0
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0answers
385 views

MacBook Pro stuck in gray screen when booting

I've got a Late-2011 15" MacBook Pro stuck in the gray screen when booting AFTER login. I've tried removing the drive (it's non-retina) and booting from a working bootable Yosemite installer, no luck. ...
2
votes
1answer
952 views

Install Windows on MacBook Pro, without OS X

I installed Linux Mint on my 2006 MBP 15" this weekend before hearing that the system will not enter a compatible firmware mode for Linux/Windows without rEFIt or rEFInd installed first. Well, I do ...
1
vote
2answers
1k views

My MacBook Pro has a flashing question mark in a folder against a grey background

My MacBook Pro shows a grey screen with a flashing question mark in a folder. I tried connecting it to an older MacBook using firewire cable. I restarted the Macbook Pro in Target Mode. Now I see ...
0
votes
1answer
212 views

Vertical green stripes when iMac starts to boot up

An iMac has 5 green vertical bars/stripes that appear on the screen as soon the system starts booting. The OS is Yosemite (10.10.?) When I try to boot the computer normally, safe boot, or ...
0
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2answers
284 views

My MacBook Pro, gets stuck at boot screen and the graphics look weird

I have a 2011 MacBook Pro i7 and I have upgraded the memory to 8 GB and the HD to an SSD 500GB. The other day I had it running for 3 days non-stop and when I tried to use it it was frozen. I reset it ...
0
votes
1answer
202 views

iMac only works in safe mode and cursor showing weird black lines (pic attached)

Have a Mid 2010 model computer IMac 21.5 that is acting up. Won't work in normal start up, will start in safe mode, but cursor shows strange black lines (see attached photo). These lines follow the ...
1
vote
1answer
310 views

iMac gets stuck on the “White Screen of Death” during startup

I have a 27" iMac (from 2011) that's running Yosemite and each time I turn the power on, it shows me the Apple logo, it starts to load, and the screen goes white and simply hangs there. To solve this ...
1
vote
1answer
16k views

a bad Shutdown resulting in a flashing folder with question mark

I was rebooting my MBP when i turned off abruptly, now when i turn on my Mac again i just see a Flasing folder icon with a question mark instead the Apple Logo. i have MacBook Pro 15" Late 2012 (Non ...
0
votes
0answers
16 views

Unnecessary option when decrypting HDD before booting [duplicate]

I've just performed a clean install of OS X Yosemite 10.10.3 on my new hard drive. Before installing i formatted the disk as an encrypted drive. When i start up my machine now i get to select between ...
0
votes
1answer
36 views

Cannot boot (Question Mark folder)

While my MacBook was connected via HDMI to a external screen it froze and I had to hard-reboot. Now I have the question-mark-folder-issue-of-the-death. I reset PRAM and SMC but nothing changed. ...
1
vote
1answer
61 views

Macbook Pro 8,1 hanging on startup

I have a macbook pro 8,1 that is having issues starting up. When I first turn it on, there is a small grey loading bar beneath the apple logo and loading circle. After the loading bar is ~20% done, it ...
0
votes
0answers
51 views

how to mount internal hd after booting with external drive?

I am running macosx 10.6.3 and trying to mount/access the internal hd through diskutility: it does not show up here. I tried this: ...
0
votes
1answer
48 views

Key to boot from USB on Ubuntu Macbook 2007

I recently installed Ubuntu 14.10 on my 2007 Macbook. I need OS X back. I burned OS X Lion (10.7) to a USB, now what?
1
vote
1answer
629 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
votes
0answers
40 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
447 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
vote
0answers
84 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
22k 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
votes
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
votes
2answers
17k 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
vote
0answers
117 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
votes
0answers
81 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
vote
0answers
183 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
votes
2answers
90 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 ...
1
vote
1answer
3k views

Screen backlight does not turn on during bootup, but turns on when accessing recovery partition

I have a late-2011 15" MacBook Pro running Mavericks. I normally don't reboot my computer and can leave it logged in for days on end. I decided to reboot my computer and when it was booting, the ...
0
votes
1answer
160 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
69 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
178 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
531 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 ...
2
votes
2answers
6k views

Problems creating Yosemite USB bootable drive

I was trying to make a USB boot loader for Yosemite using this command sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled 2 ...
0
votes
2answers
411 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
votes
0answers
153 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
382 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
68 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
75 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
322 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
43 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
65 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
votes
0answers
25 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
114 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
votes
1answer
48 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
vote
0answers
30 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
48k 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
50 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 ...