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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1answer
20 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
30 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
10 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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0answers
84 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
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0answers
64 views

Mac OS X mavericks not boooting in Lenovo z50-70 [closed]

I am trying to install Mac OS X mavericks on my Lemnovo z50-70. Bootable USB has been created using Unibeast by following ...
0
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1answer
13 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 ...
0
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0answers
26 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. However, due to the font size and being unable to screenshot it means that I haven't been able to analyse the font very clearly. ...
0
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0answers
49 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
86 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
42 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 ...
1
vote
2answers
117 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
58 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 ...
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0answers
26 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 ...
0
votes
1answer
48 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
votes
1answer
18 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
75 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
109 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
votes
1answer
59 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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2answers
92 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
719 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 ...
1
vote
3answers
509 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
35 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
36 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
304 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
317 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
230 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
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0answers
58 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
72 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
1answer
2k 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
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0answers
26 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
46 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 ...
2
votes
3answers
24k 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 ...
1
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3answers
9k 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
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0answers
48 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
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1answer
3k 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 ...
0
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1answer
26 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 ...
1
vote
1answer
29 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?
0
votes
1answer
122 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 ...
0
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0answers
75 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 ...
1
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0answers
24 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 ...
0
votes
0answers
71 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. ...
1
vote
0answers
124 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
votes
4answers
982 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
52 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 ...
0
votes
2answers
62 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 ...
0
votes
1answer
34 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).
0
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1answer
20 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, ...
2
votes
0answers
261 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 ...
1
vote
0answers
79 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
votes
1answer
56 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 ...