Sometimes, Mac won’t boot and prompts blank screen or an audible beep thus restricts you from accessing data stored on it. In such cases, you can troubleshoot problems that result in unbootable Mac. To do that, you have to access boot options where you can use Apple Hardware Test and other Mac repair options.
Here I have listed out various boot options available in Mac OS X, through which you can turn your unbootable Mac to bootable state.
Choose Another Startup Disk with the Startup Manager. To boot from a specific device, press.
When your Mac powers up, it normally uses the system on its internal hard drive unless you change this behavior by choosing System Preferences@@→Startup Disk. You can also change what your Mac does by holding down the following keys or key combinations during startup. Print these boot option keys, because they’re particularly helpful to have.
To boot from a CD or DVD: Restart your Mac while pressing the C key. This is a great way to free your startup volume when you want to test it or optimize it using a commercial utility. To eject a recalcitrant disc that doesn’t show up on the Desktop: Restart Mac OS X and hold down the mouse button, or if you have a late-model Mac, press the Media Eject key as soon as you hear that.
Booting from CD or Bootable Disc
To enter boot screen, hold down Option key. Once you enter boot screen, check for bootable devices and select the one which you want to boot into Mac OS X. Eject, F12, or Mouse/Trackpad; If you unable to remove discs that are trapped in your optical drive, then restart your Mac by holding Eject key, F12 key, or your mouse or trackpad button.
If you want to boot using CD or any other bootable disc, then insert the disk and hold down the C key on your keyboard. It will help you to boot into Mac OS X.
Apple’s Hardware Test
You can access Apple’s Hardware Test while booting from a disc which comes with your computer. Hence, hold down the D key while rebooting which help you to enter Apple Hardware Test.
Reset PRAM and NVRAM
When PRAM and NVRAM gets corrupted, you fail to boot into Mac OS X. Hence, it is better to reset both PRAM and NVRAM. To do so, hold down the Command + Option + P + R keys until Mac restarts and you hear the startup sound for second time. After that, release the keys. It will reset PRAM and NVRAM.
Selecting Bootable Devices
To enter boot screen, hold down Option key. Once you enter boot screen, check for bootable devices and select the one which you want to boot into Mac OS X.
Eject, F12, or Mouse/Trackpad
If you unable to remove discs that are trapped in your optical drive, then restart your Mac by holding Eject key, F12 key, or your mouse or trackpad button.
Network Boot
Hold down the N key while starting Mac to boot from network, in case your setup has compatible network server. If you use Option + N keys, then you can start from a NetBoot server using the default boot image provided.
Target Disk Mode
If you want to recover files from unbootable Mac, then Target Disk Mode boot option is best choice. So, press T while starting Mac to enter Target Disk Mode.
Safe Mode
To enter Safe Mode, hold down the Shift key while rebooting your Mac OS X. This boot option loads only required kernel extensions and disables non-system fonts, all startup items, and login items that are not required.
Verbose Mode
Using Command + V keys, you can boot your Mac into Verbose Mode. This key combination will show a terminal-like interface during startup. It consists data that is important for booting. And also allows to spot startup problems.
Single User Mode
To boot your Mac into Single User Mode, use Command + S keys. In this mode, you can communicate with your computer through text input. This mode helps you to fix startup issues or alter software which prevents startup.
Lion Recovery Mode
In case, you have Mac OS X Lion on your computer, then hold down Command + R keys which helps you to load into Lion Recovery Mode.
If you fail to boot into Mac even after using these boot options, then try Remo Mac Recovery and get back your data from unbootable Mac. The tool can also be used to restore a deleted partition on Mac and to recover data from formatted Mac partition.
From the makers of UNetbootin: HabitLab, a tool to help you waste less time online (for Chrome)
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Mac Os Boot Menu
UNetbootin allows you to create bootable Live USB drives for Ubuntu and other Linux distributions without burning a CD.
You can either let UNetbootin download one of the many distributions supported out-of-the-box for you, or supply your own Linux .iso file.
Features
UNetbootin can create a bootable Live USB drive
It loads distributions either by downloading a ISO (CD image) files for you, or by using an ISO file you've already downloaded.
If I remember correctly, when I had bought my Mac, the.bashlogin file wasn't there. I had to create it for myself so that I could put prompt info, alias, functions, etc.
To create an alias in bash that is set every time you start a shell: Open your /.bashprofile file. Add a line with the alias—for example, alias lf='ls -F' Save the file. Quit the editor. The new alias will be set for the next shell you start. Open a new Terminal window to check that the alias is set: alias. You should see your new alias.
Using Unetbootin
Select an ISO file or a distribution to download, select a target drive (USB Drive or Hard Disk), then reboot once done. If your USB drive doesn't show up, reformat it as FAT32. Usb disk format tool.
If you used the 'USB Drive' install mode: After rebooting, boot from the USB drive. On PCs, this usually involves pressing a button such as Esc or F12 immediately after you turn on your computer, while on Macs, you should hold the Option key before OSX boots.
If you used the 'Hard Disk' install mode: After rebooting, select the UNetbootin entry from the Windows Boot Menu.
Supported Distributions
UNetbootin has built-in support for automatically downloading and loading the following distributions, though installing other distributions is also supported:
UNetbootin can also be used to load various system utilities, including:
Installing Other Distributions Using UNetbootin
Download and run UNetbootin, then select the 'disk image' option and supply it with an ISO (CD image).
UNetbootin doesn't use distribution-specific rules for making your live USB drive, so most Linux ISO files should load correctly using this option. However, not all distributions support booting from USB, and some others require extra boot options or other modifications before they can boot from USB drives, so these ISO files will not work as-is. Also, ISO files for non-Linux operating systems have a different boot mechanism, so don't expect them to work either.
FAQs
Distribution X isn't on the list of supported distributions, will it work?
» Maybe, see Installing Other Distributions Using UNetbootin.
UNetbootin isn't able to download the distribution, what should I do?
Download the ISO straight from the website, then provide it to UNetbootin via the diskimage option.
My USB stick isn't booting, what should I do?
Reformat the USB drive as FAT32, then use UNetbootin again to put your distribution on the USB stick.
My USB stick/hard drive isn't detected, what should I do?
Reformat the USB drive as FAT32, then use UNetbootin again. If it still isn't showing up, use the targetdrive command line option.
How do I use UNetbootin from the command line?
» See UNetbootin Command Line Options.
How does UNetbootin work, and what does it do?
» See How UNetbootin Works.
» See USB Drive and Hard Disk Install Modes.
Where can I report bugs, submit patches, etc?
First, make sure you are using the latest version available on this website.
» See Github Issues to file a bug report.
» See Github Pull Requests to submit a patch.
Does UNetbootin have any spyware, viruses, trojans, or other malware?
No; though some anti-virus products may raise 'Trojan.generic' warnings due to the auto-uninstall feature, these are false positives. Just make sure you obtain UNetbootin from this site, not some shady third-party source. If you're absolutely paranoid, you can check the source code and compile it yourself.
Jules jurgensen serial number information number. The USPTO has given the JULES JURGENSEN trademark serial number of 76133266. The current federal status of this trademark filing is ABANDONED - FAILURE TO RESPOND OR LATE RESPONSE. The correspondent listed for JULES JURGENSEN is of 115 WEST AVE STE 108, JENKINTOWN PA. Serial number look-up example: Let's say you have a Waltham watch with serial number 21,607,210 as shown in the photo below. Note that we're using the serial number from the watch movement, not from the watch case. I have an old Jules Jurgensen Pocket Watch and I've been trying to get information on the watch. I've called the company but don't seem to get much response. The serial no. Of the watch is 8939 and I'm trying to get the approximate age and value. Dec 14, 2012 H: I'm peterpiper47 I've read a few threads on JJ watches I have a JJ wrist watch serial# 53175 also on the inside back cover is a number 0.585 with a 14K the watch is rectangle black hands the numbers 1-12 look like reg. May 17, 2005 I have seen a wristwatch made from old Jurgensen material with poorer finish and the serial number 217,xxx. There were several others who continued the business for many years up to the quartz era but the watches most esteemed by collectors are mechanical with serial numbers of 17,xxx or less. A Brief History of Jules Jurgensen Watches May 16, 2005.
What translations are available, and how can I use them?
A number of translations are included in the latest UNetbootin release. See the Translations Page for the status of each.
If a translation corresponding to your system's native language has already been included into UNetbootin, it should automatically load the corresponding translation. Alternatively, you can force the language to use via the lang=es command-line option, where you substitute es with the the 2-letter ISO 639-1 code for your language.
Can I help translate?
If you'd like to help translate this website, join the project on Transifex, then edit translations either on this website or on Transifex.
If you'd like to help translate the UNetbootin program itself, please use Launchpad Translations. If you are new to Launchpad, you will first have to join the corresponding Ubuntu Translators group for the language you intend to translate. For information on using the Launchpad Translations system, see the translations help page.
» See UNetbootin Translations
Removal Instructions (Applicable only to Hard Disk installs)
If using Windows, UNetbootin should prompt you to remove it the next time you boot into Windows. Alternatively, you can remove it via Add/Remove Programs in the Control Panel.
If using Linux, re-run the UNetbootin executable (with root priveledges), and press OK when prompted to uninstall.
Removal is only required if you used the 'Hard Drive' installation mode; to remove the bootloader from a USB drive, back up its contents and reformat it.
Uninstalling UNetbootin simply removes the UNetbootin entry from your boot menu; if you installed an operating system to a partition using UNetbootin, removing UNetbootin will not remove the OS.
To manually remove a Linux installation, you will have to restore the Windows bootloader using 'fixmbr' from a recovery CD, and use Parted Magic to delete the Linux partition and expand the Windows partition.
Where's the source code, and how can I compile or modify it?
Source code is on Github, though you may prefer a tarball of the latest release.
» See Compiling UNetbootin.
» See UNetbootin Command Line Options.
» See Building a UNetbootin Plugin.
Mac Os Recovery
» See Using a UNetbootin Plugin.
» See Building a Custom UNetbootin Version.
» See List of Custom UNetbootin Versions and Plugins.
License
UNetbootin was created and written by Geza Kovacs (Github: gkovacs, Launchpad: gezakovacs, contact info).
Boot Option For Mac Os X 10.13
Translators are listed on the translations page.
UNetbootin is licensed under the GNU General Public License (GPL) Version 2 or above. Site materials, documentation, screenshots, and logos are licensed as Creative Commons Attribution-Share-Alike 3.0.
Boot Option Mac Os X
Other open-source projects from the creators of UNetbootin
HabitLab
A Chrome extension to help you waste less time online (on sites like Facebook, Youtube, etc) by experimenting with different interventions (news feed blockers, comment hiders, and more) to find the ones that work best for you.