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

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6 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
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0answers
19 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 ...
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3answers
6k 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 ...
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2answers
3k 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. ...
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0answers
33 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 ...
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1answer
332 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 ...
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1answer
21 views

Clock problems with dual boot mac system:- 10.6 and 10.8

I have a dual boot mac pro 3,1 : one hard drive with Snow Leopard (10.6.8) and one with Mountain Lion (10.8.?). When I boot up with Mountain Lion it unfailingly resets the clock to about 4 am. This ...
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1answer
18 views

what does it mean if my macbook loaded in safe mode?

My MacBook just booted in safe mode. Is it possible that somehow I made it to do so, or can it automatically load in case of a malfunctioning? What does it mean if it did so automatically?
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1answer
62 views

Cannot repair disk0s2 with mavericks utility disk on a SSD

I was trying to repair a corrupted partition (OSX Mavericks) the mac doesn't boot anymore (grey apple logo with infinty spinning gear). I've just tried with safe mode, PRAM restor etc... And the ...
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0answers
33 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 ...
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0answers
18 views

How to use an external disk to boot to Windows?

I want to be able to boot into windows. I only have 256GB on my Mac, and my current windows C: drive has over 112 GB in it used. So I would like to keep the on-board SDD free for OS X. Is it possible ...
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0answers
39 views

MacBook Pro early 2011: sound loop, black screen

Over the last week I have had four similar incidents: When I played something on YouTube, the audio just loops for a few seconds, and then either the screen freezes or a black screen will appear. ...
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0answers
72 views

MacBook Pro does not boot after upgrade problem [closed]

I tried to upgrade my MacBook Pro from Mavericks to Yosemite (Developer Version.) The setup was ok, nothing wrong, but when I tried to install the Preview 8, it stopped responding right in the end of ...
6
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3answers
863 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 ...
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1answer
41 views

Mouse disconnected after booting

Everytime I boot up my iMac (OS X 10.9.3) it doesn't find my mouse. If I unplug the mouse and reconnect it after around 20 seconds, it works. It's an USB mouse. Every other USB device works fine. I ...
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2answers
53 views

MacBookPro10,1 had problems booting, now some system images are pink and fuzzy

A friend just recently bought a MacBookPro10,1 (MacBook Pro Retina, 15-inch, Mid 2012) off of craigslist, it all checked out and worked fine until we erased the hard drive and reinstalled Mavericks ...
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1answer
21 views

Where does the OS X routing table come from?

Trying to find out where the initial routing configuration for OS X is stored (plist, or wherever), and what happens at startup to read that configuration and configure the network interface(s).
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1answer
16 views

Flashing Folder on Mac Pro 1,1 after trying to Bootcamp

So I bought a Mac 1,1 and it runs great, until I tried to bootcamp it the other day with an old windows HDD i had. I downloaded windows, and tried to bootcamp it and now it will not boot the Mac HDD, ...
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0answers
149 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 ...
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0answers
49 views

MacBook won't boot from internal SSD

I got a 2011 MacBook Pro and had a Samsung 840 Pro installed running Mountain Lion, then Mavericks for about a year without any problems. Without any apparent reason the MBP just wouldn't boot from ...
0
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1answer
41 views

Macbook Pro 15 progression bar halts then circle spins

We have a Macbook Pro 15 Last 2011. The computer starts to boot, it shows the progression bar, then it disappears and the circle just spins. I have tried safe mode and it just spins. I just ran ...
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0answers
38 views

How to make a bootable (encrypted) copy in an external drive from a FileVault 2 encrypted boot partition

I configured my MacbookPro (Retina) as follows: /dev/disk0 (GUID partition scheme) EFI 200 MiB Apple CoreStorage 128 GiB <- FileVault 2 encrypted Apple Boot 650 MiB <- ...
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0answers
17 views

Create Mavericks bootable USB under Windows for MacBook Air [duplicate]

After experiments with my macbook air, I have clean hdd drive without any OS on it completely (nor recovery partitions). How can I create bootable usb flash drive to install mavericks back to my ...
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0answers
268 views

Mac alternative boot loader for booting legacy OS from USB

I am trying to install Windows 7 on my MacBook as a dual boot setup. I have a MacBook 7,1 running Mavericks. I have replaced the DVD drive with a SSD (now have 2 internal drives) so cannot use a ...
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1answer
60 views

How can i recreate my Partition Table

What happened: While i was tinkering around with my bootcamp partition something went terribly wrong. end of story is, i have no partitions left in my partition table The current situation: i can ...
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0answers
34 views

Used DiskMaker to create bootable USB, got error 10600, USB won't mount

I tried creating a bootable USB for Mavericks. Downloaded and used DiskMaker X. Got an error, -10660, and the app closed. Now my Mac won't mount (or recognize) the USB drive. It doesn't show up in ...
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1answer
128 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 ...
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2answers
63 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 ...
0
votes
1answer
1k views

How do I create a Mac bootable USB drive using Windows?

My MBA 2012 with OS X 10.9.4 Mavericks won't boot anymore - it simply freezes after the initial jingle. I already tried resetting NVRAM and SMC, but to no avail. I don't have any time machine backups. ...
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1answer
30 views

Boot off of USB drive problem - new iMac

how can i boot off of usb disk to install snow leopard onto new iMac that has mavericks installed
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1answer
51 views

Why doesn't my MacBook recognize the original HD any longer?

I replaced the stock hd with a samsung ssd (840) about 18 months ago. It died last week. I tried putting the original HD back in and the computer won't recognize it. Even when I hold down the option ...
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1answer
53 views

My mac would not boot so I formatted the drive and now it has no OS

So there is a whole other backstory as to why my computer would not boot and why I needed to format the drive. The only thing I need to know is how can I install an OS to my computer. I tried CMD-R, ...
3
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0answers
85 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 ...
0
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1answer
28 views

Mac pro 2,1 boots up but won't restart?

I am very confused with this problem. So I just recently purchased a 8 core 3.0ghz Mac Pro 2,1 and I upgraded the memory with 16gbs of hynix ram, and everything worked great the computer was reading ...
0
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1answer
337 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 ...
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1answer
2k views

MacBook Pro won't boot with new hard drive, but a different MacBook Pro will

So here are the details. My friend and I both have 13-inch Mid 2010 MacBook Pro's. Same processor and specs since they were purchased at the same time, but originally had 250 GB hard drives. His hard ...
0
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1answer
103 views

Macbook won't boot

I have a Macbook pro 13" that won't boot up. I searched for solutions online and the issue seemed battery related to me. I opened the back panel of my Mac and took out the RAM and placed it back. ...
0
votes
1answer
37 views

Mac mini won´t boot up

I have a Mac mini that fell from a desk, my kid was playing aroung and it hit the floor, I picked it up and it stared up but when the Apple logo comes up the little cricle appears and thats it, it ...
1
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1answer
321 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 ...
3
votes
1answer
49 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 ...
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0answers
18 views

Bootup error on every boot method, HD, Recovery drive, External HD system and USB?

Bootup error on every boot method, HD, Recovery drive, External HD system and USB??? I get the following error on but, white screen apple logo, then error and keeps restarting and starting cycle ...
1
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3answers
140 views

Disk became full, had to force shutdown, now it doesn't boot

Don't know why I didn't get a warning about disk being almost full... It came down to zero free space and I couldn't do anything except force-shutdown it. I booted into Windows, deleted some files ...
2
votes
0answers
148 views

How to bless a partition using a custom EFI-boot file with non-conforming directory structures and/or file names?

Is there a guide on how to bless a partition for booting, one that doesn't have the default /System/Library/CoreServices/boot.efi structure? For example, I installed GRUB on the default EFI System ...
2
votes
1answer
534 views

Macbook boots up to grey 'prohibited' symbol

I'm having an issue with my '09 13" Macbook Pro. When I boot it up, it seems to be booting normally until about thirty seconds in, when the Apple symbol is replaced with a kind of 'no-smoking' symbol, ...
1
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0answers
292 views

Windows 7 on Macbook Air 1,1 *without* Boot Camp

I'm trying to install Windows 7 on an early 2008 (1,1) Apple Macbook air, on which OS X is not present. The machine is not able to boot directly the win 7 iso, supposedly because it lacks some support ...
1
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1answer
74 views

Boot menu not working

So basically I can't boot from my ssd anymore. It just shows a grey screen with an error symbol. I can't get into target disk mode and none of the other boot shortcuts seem to be working either. When ...
0
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0answers
99 views

After strange startup issues TimeMachine/Migration not working properly, some data seems to be lost

since I couldn't find a solution for this problem I hope somebody of you may have one: When I was in holiday 2 weeks ago and repeatedly tried to boot my MacBook Pro 15" (2012, DIY Fusion, FileVault 2 ...
0
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1answer
48 views

If I mess up the EFI System Partition, will Mac OS X be unbootable?

I forgot to make a backup of my EFI System Partition (ESP) and have installed grub onto it. If I happen to accidentally mess up the partition, will OS X be bootable? If not, how would I restore the ...
0
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2answers
4k 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 ...
2
votes
0answers
109 views

Startup Screen Flashes Pink

During boot, I see the gray screen with the Apple logo, then the entire screen flashes pink for a couple seconds before boot continues normally. Is this a problem/symptom of something? MacBook Pro ...