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

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0answers
649 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 ...
0
votes
1answer
368 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 ...
4
votes
1answer
569 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 ...
0
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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 ...
0
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0answers
29 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
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1answer
134 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
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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 ...
4
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1answer
1k views

How to start to recovery mode in a Mac OS X VM in Parallels?

Is it possible to start into Recovery/Internet recovery mode in a virtualized Mac OS X in Parallels? It would come in handy to take screenshots of those UIs or running apps to exemplify some steps ...
0
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1answer
234 views

Shell script to boot OSX in recovery mode and execute another shellscript

I'm working at a University and we are restoring our Macs using Apples ars which works great. The process is to manually go to the computer - reboot it in recovery mode and then run the ars command to ...
2
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0answers
90 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
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1answer
298 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
47 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
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1answer
53 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. ...
0
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2answers
1k views

SSD w/ brand new clean in stall of Yosemite fails to boot

I've just installed a new version of Yosemite on a third party SSD (Crucial). When I boot it up it hangs on a gray screen. Steps that got me here: Connect SSD to Macbook Pro (with existing HD) ...
0
votes
1answer
623 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 ...
1
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1answer
21k 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
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0answers
159 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 ...
0
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0answers
49 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 ...
1
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2answers
20k views

Macbook Pro Crashing and Startup Failure

Firstly, some background information for the problem: My girlfriend's Macbook Pro had an issue that was annoying, but not fatal. Roughly once a day (but sometimes not for a few days, and sometimes ...
0
votes
1answer
105 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 ...
1
vote
1answer
135 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
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0answers
206 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, ...
0
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2answers
525 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 ...
1
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2answers
339 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
3answers
8k 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 ...
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0answers
458 views

How to disable OS X installer on boot?

TL;DR Have a MacBook Pro with (probably) bad GPU. Tried to install Yosemite OS X - after reboot, it hangs up on grey screen. Is there a way to disable Yosemite OS X (or any other) installer on boot ...
0
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0answers
103 views

MacBook Pro 15" Reoccuring Freezing Problem

I have a MacBook Pro 15" that has been having a reoccurring issue. It gradually starts to slow down while using it, starts freezing, and then will get stuck on the Apple logo loading screen after ...
1
vote
1answer
443 views

GRUB overwritten Refind/Mac bootloader - Unable to boot

Getting desperate here, need some help background: I have a late 2012 imac, running OS X 10.10 Also i had Xubuntu & OpenSuse running as secondary OSs I was using refind & everything was ...
0
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1answer
43 views

How to change boot login

How Do I change the user for the Boot login? I had changed my username recently and have deleted the temporary admin that has been made to change my username, but the Boot Login has somehow changed to ...
4
votes
2answers
319 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 ...
1
vote
1answer
9k views

Mac boots into log on screen quickly but takes long time to log into account

I just replaced the stock OEM hard drive on my 2010 macbook pro 15 inch with a Samsung 840 Pro SSD 256GB and installed Yosemite on it from scratch with USB (the first time i am using Yosemite). Now ...
0
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1answer
642 views

Booting from Windows USB Key Overwrote EFI - Mac No Longer Boots

I'm using a macbook pro running Yosemite. I was trying to create installation media to install linux on an SD card, and I used a USB key that had a bootable windows installation on it. I thought I had ...
0
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3answers
2k views

Yosemite boot times

I have a brand new iMac 3.5GHz i5 with 8GB of RAM with a non SSD drive. When I boot Yosemite it takes 52 seconds from the gong to the desktop, most of which is spent with the progress bar. This seems ...
1
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0answers
4k views

rEFIt boot changed after update to Yosemite

I was using rEFIt to work with Ubuntu with my Mac. After the upgrade to Yosemite I had a problem with rEFIt. I found the following solution on ubuntuforums.org but rEFIt still didn't work: cd ...
2
votes
3answers
10k 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 ...
1
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0answers
135 views

I cant see my bootable 10.9.3 usb drive on mac

I downloaded 10.9.3 dmg file (aprox. 5gb) from torrent site. Than I installed trasmac to my other windows computer and created a bootable usb with it. But when I plug this usb to my mac I could not ...
0
votes
1answer
832 views

Booting an iMac using a Macbook Pro's internal disk

Suppose I have an iMac and a Macbook Pro. My Macbook Pro is my primary workstation, and when I switch to the iMac I would like my environment to be exactly the same in order to facilitate switching ...
1
vote
1answer
888 views

Can VirtualBox prevent Mac OS X Yosemite to boot properly?

After a few days of good experience with Yosemite, my Macbook pro cannot boot anymore. After 30 or 40% of boot, it just restarts. Here are what I did to fix it: Booting to single-user, runnign fsck ...
2
votes
3answers
3k views

iMac won't boot off of Mavericks USB when downgrading from Yosemite

I made the biggest mistake of my adult life and installed Yosemite without backing up my HDD. Fortunately, I do have most of my actual files and programs saved to my external HDD, but that leads to ...
2
votes
0answers
3k views

iPad 1 won't boot, flashes apple logo

I have recently acquired a refurbished iPad 1 WiFi + 3G. Straight out of the box it wouldn't boot up at all. No logo, or anything. Upon plugging the device into the AC power charger, the Apple logo ...
0
votes
0answers
156 views

MacBook Pro wont boot: Stuck on Grey Screen

So, I've done all the typical checks, including putting the Macbook in target disk mode and wiping and resinstalling OS via my other computer. I know the drive is functioning - I can boot my desktop ...
1
vote
1answer
228 views

No Partition to install Yosemite to

I wanted to have a clean Yosemite installation. Therefor I deleted the existing partition to make sure a completely clean installation is made. The problem is that I cannot choose the partition to ...
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 ...
0
votes
0answers
74 views

External disk boots installation system, but not installed OS

I have an external NewerTech Voyager Q, connected with Firewire. In it I have my old internal HD. I used to have OS X Snow Leopard on it, so it's correctly formatted and bootable but it would never ...
1
vote
1answer
135 views

Unable to boot into ElementaryOS on MacBook after PRAM reset

I installed ElementaryOS on a separate partition of my HDD. Not sure what happened but the audio in OSX stopped working after the installation. After trying everything else, I found resetting the ...
3
votes
3answers
50k 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 ...
2
votes
5answers
25k 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. ...
0
votes
0answers
130 views

Brand new Macbook Pro no longer working — can't reinstall, can't boot into recovery

Just got a brand new macbook pro w/ retina for my gf about 2 weeks ago. She's been on the laptop about 4-5 times. The last time she tried getting on it, she kept logging in and getting to a screen ...
0
votes
3answers
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
1answer
6k views

Fixing a Windows partition boot using OS X tools

I've got a triple boot system on my Early 2013 Mac Book Pro: OS X, Windows 7 and Ubuntu. I'm using rEFInd as my boot manager. My Windows install boots using legacy BIOS boot, and OS X and Ubuntu boot ...