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

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3
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3answers
32k 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 ...
3
votes
4answers
28k views

How can I disable Safe Boot or the Shift Key?

After a spill on the keyboard of my unibody MBP 17", the ⇧ key reports as always on. Under Windows (BootCamp) and Linux (LiveDVD) I can easily get around the problem by using an external ...
3
votes
1answer
2k views

Upgrading new Mac Mini to have SSD. Do I have to buy Lion, or can I just re-download from App Store?

EDIT: The accepted answer below works, but I can also confirm that just booting the stock machine and visiting the App Store, you can just re-download it and make a boot USB drive before swapping out ...
3
votes
4answers
1k views

Why does RAID 1 “Mirroring not provide performance improvements”?

I have always used Software RAIDs, either Apple-provided, or via SoftRAID, etc. I am about to re-zhuzh my arrays and decided to do a little research beforehand… and On Apple's site, there is a ...
3
votes
3answers
5k views

How can I reset the PRAM if Recovery Mode keeps overriding the PRAM command?

Lion uses the ⌘ + R to boot into recovery mode. Resetting the PRAM in anything less than 10.7 was ⌘ + ⌥ + P + R. Recovery mode now seems to override the PRAM command. Does anyone ...
3
votes
1answer
64 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 ...
3
votes
2answers
969 views

Security hole in firmware password by installing another boot loader?

I set up a firmware password on my MacBook. One thing I don't understand is how I can install a tool such as rEFIt, and effectively bypass the entire firmware password (i.e. installing it never asked ...
3
votes
3answers
7k views

What does no chime on boot mean?

My MacBook Pro is having some issues. It boots. But the graphics card doesn't get detected. You can remote in to it but looking at the Displays dialog in System Preferences, no graphics card is shown: ...
3
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2answers
3k views

Macbook Air not waking up from Suspend/Sleep with rEFInd boot manager installed

Having installed both rEFInd 0.6.10 (updated to 0.6.11) via its install.sh and Ubuntu 13.04 on another partition I can now choose on a MacBook Air to boot either MacOS or Linux. When running MacOS ...
3
votes
1answer
12k views

How can I make a bootable Windows 7 usb in OSX Lion?

I want to make a bootable Windows 7 USB in OS X Lion. How can I do that?
3
votes
1answer
424 views

iMac will not boot

An office iMac will not boot - it sits at the gray startup screen with the progress circle spinning continuously. I have tried: Booting in safe mode (same result) Booting in recovery mode (same ...
3
votes
4answers
10k 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 ...
3
votes
1answer
8k views

Can I boot Mac from an external hard drive (internal hard drive+hard drive closure)

Model: Macbook Pro 2010 mid OS: OS X 10.9 Hard Drive: WD5000BPKT 500GB For some reason I need to change my perfectly working internal bootable drive to external bootable drive. I took out my ...
3
votes
1answer
4k views

Can I boot Linux (any distro?) from USB on a MacBook Air that has no hard drive?

I've a MacBook Air that has burned out three hard drives from OWC. The original drive is gone somewhere, and it no longer makes sense to purchase a replacement. The rest of the hardware is in good ...
3
votes
3answers
4k views

Logging out and in on OS X takes 4-5 minutes?

I've got a 3.4 GHz i7 iMac (8 cores) with 24 GB of RAM. (2 16 GB chips plus 2 4 GB chips.) I know this amount of RAM is "officially unsupported" which is why I mention it. Lately logging out (to ...
3
votes
1answer
37k 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, ...
3
votes
3answers
7k views

Macbook Pro (Late 2011) Bootcamp and USB boot questions

I have a Macbook Pro with an OWC DataDoubler drive caddy replacing the Superdrive (installed at an Apple premium reseller, when I bought it, so I can still have my warranty). The main drive slot has ...
3
votes
2answers
3k views

How can I fix permission issue when I cannot start Mac OS X?

I was creating a guest account and to prevent it from accessing the Macintosh HD as in other applications and stuff I assigned it as in "No Access" When I switched to the guest account everything ...
3
votes
3answers
2k views

Installation stuck at grey boot screen on Macbook Pro 4,1 (Early 2008)

I would appreciate any help you guys can give me since I would really like to upgrade my laptop to Mountain Lion. Computer: Macbook Pro 17" 4,1 (Early 2008) RAM: 4 GB RAM Hard drive: 128 SSD Hard ...
3
votes
1answer
373 views

Mac Mini Server running Mountain Lion (10.8.2) is freezing during boot (last line: IPv6 packet filtering initialized)

Starting in verbose mode (Cmd+V), the last line I see on the console is: IPv6 packet filtering initialized, default to accept, logging disabled This happens regardless of having an ethernet cable ...
3
votes
2answers
589 views

Help diagnose errors on MacBook that will not boot

I have a MacBook which won't boot beyond the grey screen / Apple logo. With some key combo (can't remember what I did!) I managed to get a black screen with text output - see image. Can anyone offer ...
3
votes
1answer
2k views

How do I prevent automatic mounting of all the partitions on a flash drive?

I have a flash drive that I use for various diagnostics on macs. Most of the partitions on the drive are accessible by holding down the option key on boot. I also have one extra partition that is not ...
3
votes
1answer
409 views

MacBook Air dual boot Lion+10.6

Can a 2010 MacBook Air internal SSD be configured for the dual-boot of both Lion/10.7.x and Snow Leopard/10.6.x? If so, how much extra storage space is required for 2 boot partitions vs. one? Other ...
3
votes
1answer
400 views

Mac Book Pro 3,1 uneven startup behavior - sometimes start between 5min to 30min after pushing power button

First of all my Mac Book Pro wont start up after going to sleep mode - all black screen etc. When i choose power down from the menu - well it doesnt power down completely - the harddrive is still ...
3
votes
1answer
3k views

Is the first boot after a full system restore from TimeMachine supposed to take a long time?

I have had the hard drive in my iMac replaced and now I'm trying to restore it from my TimeMachine back up. I thought the TimeMachine back up was corrupt but maybe I'm just not patient enough, or I'm ...
3
votes
1answer
1k views

How do I boot into the EFI firmware shell?

I'd like to experiment with the EFI shell on a MacBook Pro 2010 model. I am unable to find the keyboard sequence to hold on boot. Does someone know what the sequence is, do I need to boot from my ...
3
votes
1answer
507 views

How can I get boot details when booting from Snow Leopard DVD?

I'm running into a situation where I need to repair my main partition but I can not get my machine to boot off the Snow Leopard DVD. It will boot up, let me choose my language, then go to the ...
3
votes
1answer
59 views

Possible reasons (other than Open Firmware Password Protection) for not being able to boot into single user mode?

Recently I was attempting to install some new software for a user. I followed these instructions to create a new admin-level account but when I held down cmd+S while booting it still booted into the ...
3
votes
2answers
378 views

Add Static ARP Entry at Boot

I'm new to Mac OS X. On Linux I'd: append to /etc/rc.local arp -i eth0 -s 192.168.1.1 00:00:00:00:00:00 I've figured out how to do it in Terminal: sudo arp -s 192.168.1.1 00:00:00:00:00:00 But ...
3
votes
2answers
2k views

Boot from different drive without using Alt/Option

My 2011 27 inch iMac will not boot, it plays the startup sound and then freezes on a white screen. I am fairly confident I could fix it myself if I could get it to boot from a USB drive or external ...
3
votes
1answer
366 views

How to set up an iMac not to look for USB Flash drive info during boot up?

Short question: is there a way to disable an iMac's USB Flash Drive boot up so that boot up time is faster? Details: My iMac has an external USB hub, and it has 3, 4 or sometimes 6 or 7 USB Flash ...
3
votes
1answer
2k views

Diagnosing a dead MacBook Pro

Anyone got a good checklist for diagnosing the problem with a dead MacBook Pro ? I've a 15" MacBook Pro Core Two vintage machine that has suddenly stopped booting up. I can hear the Superdrive spin ...
3
votes
2answers
304 views

Is it possible to specify a different root device to a MacOS kernel?

I have an old iBook (2003, G4) with a burnt-out harddrive. Being a poor academic, I don't want to bother with replacing the drive. I'd like to use an external USB drive in place of the harddrive. I ...
3
votes
3answers
810 views

How do I clone a dual-boot Macbook

I have a Macbook Air set up for dual-boot (Lion & Windows 7) and am planning on buying a newer model. How would I go about cloning the entire hard drive to the new machine? Do I need to ...
3
votes
0answers
16 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 ...
3
votes
0answers
289 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 ...
3
votes
0answers
134 views

Modify SATA link speed down (Mac won’t boot)

I have a MacBook Pro (Early 2011, MacBookPro8,2) which I cannot reboot, otherwise I have to reinstall Mavericks every time. Sleep mode works, luckily, but sometimes I need to reboot. In April my HDD ...
3
votes
0answers
57k 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
2answers
716 views

Boot up error prohibitory sign flashing folder with question mark

3 weeks ago my hard drive failed so I bought a new one. (Macbook pro late 2011) 5 days ago, the new one flashed prohibitory sign, flashing folder with question mark. Every once in a while I could get ...
3
votes
2answers
5k views

Cannot access vital boot options on Mac Pro with OS X Lion

I have this used Mac Pro (mid-2010) that I recently bought, that came with OS X Lion installed. It was apparently installed from an image because there are a lot of installed apps and, though there is ...
3
votes
1answer
239 views

FreeBSD Install DVD corrupted my Mac OS X harddisk

Recently, I have tried a FreeBSD 7.4 i386 Install DVD, just to see some screens of FreeBSD on my Mac mini Intel 2006. I was going to see (to remember) just several dialog screen of and perhaps I would ...
3
votes
1answer
95 views

How to diagnose long start up

My Macbook Pro (OSX 10.8.2) is taking a long time to settle down after booting. I am guessing there are some background processes/apps that are taking a while to start and hogging resources. What is ...
2
votes
5answers
2k 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 ...
2
votes
5answers
770 views

How can I install OS X Lion on a new HDD?

I need OS X Lion on a new HDD that I am preparing to install in a MacBook. Since I don't have an existing disk to boot up and Apple isn't selling flash drives with it (or are they?), how do I use it ...
2
votes
2answers
262 views

My MBP will not startup properly!

I have a Macbook Pro 2008 aluminum 15-inch that runs on OSX snow leopard. Whenever I turn on my laptop, it boots up (apple logo and spinning wheel appears), and then goes into a loop of blue screens. ...
2
votes
2answers
419 views

On/Off vs. Sleep Mode

The new retina MacBook Pro is boot so quickly that if I don't use it for even 5 minutes it doesn't make a difference to me whether I shut the computer down or sleep it. What is the best option for ...
2
votes
2answers
5k views

Can I use 16 GB RAM with my MacBook Pro 7,1?

I just picked up 16GB of RAM for my MacBook Pro, running the newest OS X. According to the NewEgg reviews, it should work in it. However, once I boot up, it shows the Apple logo and, after a few ...
2
votes
2answers
6k views

Ubuntu bootable USB drive does not show up as bootable

I tried to make a bootable Ubuntu installation USB drive accordning to these instructions. However, when the procedure is finished, the USB drive does not show up in the "Startup Manager", nor does ...
2
votes
4answers
10k views

MacBook Pro not booting after update to Mavericks

I installed Mavericks (upgrading from Mountain Lion) on my MacBook Pro (from early 2011) and the install seemed to go fine. However, this morning while I was working on PowerPoint, it switched off ...
2
votes
1answer
379 views

How does Apple achieve such an ultra fast boot up?

I'm a recent Mac user (MBP) and the booting time really surprises me. Within few seconds, from complete power down, the OS prompts you to log in, then the rest just flies! And even faster recovery ...