Windows 8 No Boot Device
Summary: This post mainly tells how to fix MBR in Windows 8 using MiniTool Partition Wizard if the operating system fails to boot and reports 'What is MBRMBR is the master boot record of a hard disk. It is created on the first partition when you first install Windows. MBR consists of three parts, i.e. Boot Loader, Partition Table and Magic Number. Boot loader is a program that loads an operating system when a computer is turned on. Partition table records partition information on local disks. Magic number(0xAA55/0x55AA) marks the device as a valid bootable media.
Dell No Boot Device Found Windows 10
The last resort towards fixing no bootable device found issue is to reinstall the Windows operating system. Prepare a Windows installation CD, DVD or USB flash drive and insert it to your computer. Then restart your PC and boot from the disc and follow the instructions to customize setup preferences and install OS. If you have a UEFI based system and you still can't boot Windows 8 Setup from the flash drive, even after setting the USB device first in the boot order, see Tip #1 below for help. If you came here from our How to Clean Install Windows 8 or 8.1 tutorial, you can return there now to continue the walkthrough of that process.
An invalid magic number indicates a corrupted or missing MBR. Master Boot Sector contains 512 bytes in total, of which the boot loader takes up 446 bytes, partition table 64 bytes, and magic number 2 bytes. If the MBR is damaged, you won’t be able to boot into Windows.Necessity to Repair MBR in Windows 8Why fix MBR in Windows 8? Obviously, this is due to MBR damage.
And this damaged can be caused by virus attack, power outage and improper operations like listed below:As we have mentioned, if the master boot record is broken, your computer will fail to boot and show you some of the following errors:1.' Error loading operating system001f'2.' Operating System not found' or 'Operating System missing'3.' Invalid partition table'4.' Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key'In this situation, you have to roll up your sleeve and find a way to in Windows 8. Two Ways to Fix MBR in Windows 8Normally, there are two ways to repair MBR.
Follow the instructions below to repair master boot record by yourself.1. Fix MBR with command prompt and installation DVDFix MBR with command prompt requires the original Windows 8 or 8.1 installation DVD. The instructions are:1.Boot from the original installation DVD.2.At the Welcome screen, click 'Repair your computer'.3.Choose' Troubleshoot Advanced options Command Prompt'.4.When the Command Prompt loads, type the following commands in order: 'bootrec /FixMbr bootrec /FixBoot bootrec /ScanOs bootrec /RebuildBcd'. Remember to press 'Enter' after each command and wait for each operation to finish.5.Remove the DVD from the disk tray.6.Type exit and Hit 'Enter'.7.Restart your computer and check if Windows 8/8.1 can boot now. 2. Fix MBR without CDAnother feasible method is by using third-party software to repair MBR without CD. Currently, There is lots of partition software in the market that can achieve this goal, and is among the most reliable ones. In addition, no professional knowledge is required, and only three steps are needed.
Next, we will show users the detailed steps.MiniTool Partition Wizard Bootable CD Helps to Fix MBR in Windows 8 without CDMiniTool Partition Wizard Bootable CD is the bootable edition of MiniTool Partition Wizard generated by MiniTool Bootable Media Builder, which is a paid feature embedded in each paid edition of MiniTool Partition Wizard, such as the Pro Edition. So first of all, you need to get a paid edition to unlock Bootable Media Builder feature.Step 1: Users need to create a bootable CD/DVD/USB drive with Bootable Media Builder feature.
Windows 8 No Boot Device Available
After that, connect boot flash drive with computer to start the very computer.Reference:Step 2: Set computer to boot from the bootable media. Press '+' '-' to move the target bootable media to the first place and then press F10 to save settings.Step 3: Soon you will see the following interface. You should select 'MiniTool Boot Disc' to go on.Step 4: After successful boot, users will see the main window of MiniTool PE Loader, where you can enter MiniTool Partition Wizard Bootable CD.Step 5: To fix MBR for Windows 8, users need to select the target disk and choose the function ' Rebuild MBR'. At last, click on the icon 'Apply' to execute changes.After these operation, we can say the work to repair MBR in Windows 8 is finished.
Now you can remove the bootable media and set your computer to boot from the system disk.