No Bootable Device For Mac

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These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

The macOS installer file is large with approximate size of 6 to 10GB depending upon the. Remove and connect back all hardware components. At first, you can completely power off your. I have a mac mini running OSX with Windows 10 (version 1903 build 18362) on it. For years everything worked nicely. Suddenly yesterday when I tried rebooting from mac to windows, the windows started saying 'no bootable device found.' I read many threads, including this one. Option/Alt key press and hold till boot device found.

Download macOS

Find the appropriate download link in the upgrade instructions for each macOS version:

macOS Catalina, macOS MojaveormacOS High Sierra
Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation. Important: To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server. Microsoft expression encoder 4.

OS X El Capitan
El Capitan downloads as a disk image. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.

Use the 'createinstallmedia' command in Terminal

1. Connect the USB flash drive or other volume that you're using for the bootable installer. Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
2. Open Terminal, which is in the Utilities folder of your Applications folder.
3. Type or paste one of the following commands in Terminal. These assume that the installer is still in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace MyVolume in these commands with the name of your volume.
   Catalina:*
   Mojave:*
   
   High Sierra:*
   El Capitan:
   
4. Press Return after typing the command.
5. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
6. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created.
7. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Catalina. You can now quit Terminal and eject the volume.

* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument, similar to the way this argument is used in the command for El Capitan.

Use the bootable installer

After creating the bootable installer, follow these steps to use it:

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1. Plug the bootable installer into a compatible Mac.
2. Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. Your Mac will start up to macOS Recovery.
   Learn about selecting a startup disk, including what to do if your Mac doesn't start up from it.
3. Choose your language, if prompted.
4. A bootable installer doesn't download macOS from the Internet, but it does require the Internet to get information specific to your Mac model, such as firmware updates. If you need to connect to a Wi-Fi network, use the Wi-Fi menu in the menu bar.
5. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more

For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:

Catalina: Microsoft office word download for mac.

Mojave:

High Sierra:

El Capitan:

Background

If your computer pops out message 'No Boot Device is Available' error, there are some problems on your windows system, but no need to worry about that, this article will show you how to fix'no bootable device is available' error for totally free if you are seeing this no bootable device error on Dell HP ACER ASUS TOSHIBA LENOVO in Windows 10 8.1 or Windows 7 computer.

Table of Contents

• How to fix Computer No Boot Device Available Error Problem?
  • Fix no boot device available error due to active partition error(tested)

What happened when your computer says No Boot Device Available?

When your computer pops out a message says no boot device available error often means the computer operation system is not available to find the bootable hard disk, so it can not start to boot, so if you want to know how to fix it, you need to figure out why your computer system can not find the boot device.

Here are some causes, you can check if your computer is at the same situation.

Causes of Computer No Boot Device Available Error

1. The computer just has been misled to boot from an unbootable hard disk or device

If you attached an external hard drive or USB and wrongly set it as a boot device, or you used to change your PC boot device order, these actions may lead to no boot device available error. In this situation, you can check your boot device order in BIOS mode.

2. The computer internal hard disk gets jammed/damaged or corrupted somehow

When your internal hard disk get jammed or damaged somehow, your computer may also reports that no boot device available error. You can check the disks status and running diagnosis.

3. The computer's boot hard disk MBR sector has corrupted somehow

The MBR sector is a hard disk that contains operating system files and drives required to start a computer. Therefore, once this drive is damaged, such PC 'boot device not found' issues will happen.

4. The Operating System has changed configuration settings or damaged disk

Normally 'no bootable device available' issue is caused by operating system errors. For instance, your OS updated its system files or experienced file losses when it frozed? I wouldn't deny that those situations may occur during daily use. Doesn't matter what is the cause of it, check your OS files and folders might be a solution to it.

5. The computer infected with virus

Trojan is the biggest nightmare for any internal hard disk and it can damage the hard disk MBR sector, OS files and folders, as well as internal hard disk and even more somehow you will have to deal with it eventually. We truly hope it have not done any harm.

How to fix Computer No Boot Device Available Error Problem?

1. Check or reset the boot order on your PC.

First, you can check or reset the boot order on your computer system, steps are as follows:

Step 1: Turn on your computer and press 'F2' button to switch to BIOS mode.

Step2. Click 'BIOS Setup Utility' option bar and select 'Advanced BIOS Features'.

Step3. Highlight 'Hard Disk Boot Priority' area simply check or reset your bootable hard disk on top of the boot device list.

Step4. Press 'Esc' to re-start your computer. Generally, your computer will operate well beyond any of your expectations. when 'no boot device available'happens, it often means you set a wrong boot disk.

2.Fix no boot device available by resetting the BIOS configuration

Step1: Go to BIOS mode by pressing 'F2'.

Step2: Make sure the 'SATA-0', 'SATA-1', 'SATA-2' all on, if there are off, computer cannot find the boot drive.

3.Fix 'no boot device' error with Troubleshoot

The second tool you can try is Troubleshoot.

Step1: Insert the Widows 10 bootable installation DVD. Click the 'Repair your computer' on the left corner of computer screen.

Step2: click 'Troubleshoot', and enter 'Advanced options'.

Step3: click 'click Automatic Repair or Startup Repair' in the advanced options. Wait for a while, after this process, restart your computer.

4. Fix no boot device available error due to active partition error.

If there is more than 1 active partition that boots the system, then Windows does not know which one to boot. This may happen due to your using of Disk Management or other disk mange software to adjust the disk partitions before the error happens, the problem may exist on your hard disk.

Crestron toolbox software download. How to fix active partition error?

1. You can take your disk out and insert in on another computer. (Or use Diskgenius usb bootable edition)

2, Check how many active partitions are there on the disks. If there is more than one active partition, set the rest except the c drive inactive. (use DiskGenius which shows as following photo and use its 'set inactive')

3, Keep the c drive as active only, and the error can be fixed.

Why? Active partition is set as bootable partition which contains operation system. When other partition is set as active, system cannot find the boot partition so there will be a boot failure.

Here are some causes, you can check if your computer is at the same situation.

Causes of Computer No Boot Device Available Error

1. The computer just has been misled to boot from an unbootable hard disk or device

If you attached an external hard drive or USB and wrongly set it as a boot device, or you used to change your PC boot device order, these actions may lead to no boot device available error. In this situation, you can check your boot device order in BIOS mode.

2. The computer internal hard disk gets jammed/damaged or corrupted somehow

When your internal hard disk get jammed or damaged somehow, your computer may also reports that no boot device available error. You can check the disks status and running diagnosis.

3. The computer's boot hard disk MBR sector has corrupted somehow

The MBR sector is a hard disk that contains operating system files and drives required to start a computer. Therefore, once this drive is damaged, such PC 'boot device not found' issues will happen.

4. The Operating System has changed configuration settings or damaged disk

Normally 'no bootable device available' issue is caused by operating system errors. For instance, your OS updated its system files or experienced file losses when it frozed? I wouldn't deny that those situations may occur during daily use. Doesn't matter what is the cause of it, check your OS files and folders might be a solution to it.

5. The computer infected with virus

Trojan is the biggest nightmare for any internal hard disk and it can damage the hard disk MBR sector, OS files and folders, as well as internal hard disk and even more somehow you will have to deal with it eventually. We truly hope it have not done any harm.

How to fix Computer No Boot Device Available Error Problem?

1. Check or reset the boot order on your PC.

First, you can check or reset the boot order on your computer system, steps are as follows:

Step 1: Turn on your computer and press 'F2' button to switch to BIOS mode.

Step2. Click 'BIOS Setup Utility' option bar and select 'Advanced BIOS Features'.

Step3. Highlight 'Hard Disk Boot Priority' area simply check or reset your bootable hard disk on top of the boot device list.

Step4. Press 'Esc' to re-start your computer. Generally, your computer will operate well beyond any of your expectations. when 'no boot device available'happens, it often means you set a wrong boot disk.

2.Fix no boot device available by resetting the BIOS configuration

Step1: Go to BIOS mode by pressing 'F2'.

Step2: Make sure the 'SATA-0', 'SATA-1', 'SATA-2' all on, if there are off, computer cannot find the boot drive.

3.Fix 'no boot device' error with Troubleshoot

The second tool you can try is Troubleshoot.

Step1: Insert the Widows 10 bootable installation DVD. Click the 'Repair your computer' on the left corner of computer screen.

Step2: click 'Troubleshoot', and enter 'Advanced options'.

Step3: click 'click Automatic Repair or Startup Repair' in the advanced options. Wait for a while, after this process, restart your computer.

4. Fix no boot device available error due to active partition error.

If there is more than 1 active partition that boots the system, then Windows does not know which one to boot. This may happen due to your using of Disk Management or other disk mange software to adjust the disk partitions before the error happens, the problem may exist on your hard disk.

Crestron toolbox software download. How to fix active partition error?

1. You can take your disk out and insert in on another computer. (Or use Diskgenius usb bootable edition)

2, Check how many active partitions are there on the disks. If there is more than one active partition, set the rest except the c drive inactive. (use DiskGenius which shows as following photo and use its 'set inactive')

3, Keep the c drive as active only, and the error can be fixed.

Why? Active partition is set as bootable partition which contains operation system. When other partition is set as active, system cannot find the boot partition so there will be a boot failure.

Also read: 3 ways to set partition active with freeware

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5. Check, Repair or Reinstall Computer Operating System.

After these steps, if your computer no boot device available error is not solved, you can check the operating system files and folders. If the problem happened because of unexpected deletion, try to recover them first with our undelete file recovery software. If they can't be restored, try updating or reinstalling your operating system to see whether the same 'no boot device available 'error message pops.

6. Check or restore MBR sector from your boot hard disk.

There is another possibility that your no boot device available error is caused by bad MBR sector on your boot hard disk. MBR is master boot record, check and restore your hard disk MBR sector will help you repair it. Command line can help you solve this.

Step 1: Backup the MBR by a command:

'dd if=/dev/sda of=/path-to-save/mbr-backup bs=512 count=1' ('path-to-save/mbr-backup' is the path where you want to save mbr-backup)

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Step 2: Restore the MBR by a command:

'dd if=/path-to-get/mbr-backup of=/dev/sda bs=512 count=1' ('path-to-get/mbr-backup' is the path where you have the mbr-backup stored.)

7. Run antivirus software or format your hard disk to clear the virus

And your'boot device not foundr'error may also caused by virus infectious, you can run a antivirus software or format your disk to clean the virus.

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Recover the data on your computer

What can you do when your device is not accessible? iCare Data Recovery Free is 100% freeware for a inaccessible device recovery that you may download it here.

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Plus Most of the solutions may format your data on the disk, if you want to make sure the safety of your data, you can use a professional data recovery tool to restore your data from your unbootable hard disk.

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Notice: Choose a read-only program, which will do no harm to your data.

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