Windows Stop 0x0000007B INACCESSIBLE_BOOT_DEVICE error

Updated: 05/05/2017 by Computer Hope

Remove any new hardware, discs, and USB drives

windows boot device errorIf you've recently installed any new hardware, remove it to verify it's not the cause of your issue. Next, make sure no discs (CD's, DVD's, etc.) are in any drive. Finally, disconnect any USB devices from the computer, including any thumb drives, external backup drives, iPod's, etc. to verify they're not causing the issue.

New hard drive

If you've recently installed a new hard drive and are encountering this error after installing the new hard drive, it's likely because it's not configured properly. If the new hard drive is an IDE/EIDE hard drive, make sure you have the jumpers for that drive and any other drive connected on the same cable properly configured.

Check boot sequence in CMOS setup

Verify your boot sequence is properly configured in the CMOS setup. We recommend your boot sequence be set to CD-ROM/Disc drive first and the hard drive second.

If UDMA is available and enabled for your hard drive in CMOS, we also suggest disabling it to determine if it's the cause of the issue.

Finally, if any changes are made in CMOS setup, make sure to save the changes before exiting.

Use last known good configuration

If the computer has been able to get into Windows in the past and you can get to the Windows advanced boot options menu (asking for Normal Windows, Safe Mode, etc.), choose the Last known good configuration option.

Run chkdsk and fixboot from the recovery console

From the Windows recovery console, run chkdsk /f and fixboot to check for any hard drive errors and fix any issues with the boot files.

Inaccessible boot device during Windows setup

If you're trying to install Windows or have finished installing Windows and are getting this error, it could be caused by any of the below possibilities.

Device driver for hard drive not loading

If you have SCSI or RAID setup on your hard disk drives, it may be necessary to load the third-party drivers during setup. As setup starts, you should see a prompt "Press F6 if you have to install a third-party SCSI or RAID driver". Press the indicated key and make sure to load the proper drivers for your hard drives.

Windows 2000 and Server 2003 using USB CD-ROM

If you've installed Windows 2000 or Windows Server 2003 using a USB CD-ROM drive, see KB883114 for a patch that applies to this issue.

Reinstall Windows

If you're not encountering this issue during the install of Windows or immediately after reinstalling Windows, we'd suggest following the above steps to reinstall Windows. To help verify this is not a hard drive issue, we suggest that during the setup you delete and recreate all the partitions on the hard drive, format the drive, and then install Windows. If you encounter any errors during the format process, it's likely that the hard drive is bad and was the original cause of your issue.

Bad hardware

Finally, if after all the above steps have been followed, you still cannot install or boot into Windows, you may have a hardware problem. Your computer may have a bad hard drive, bad cable, or bad motherboard connection. We suggest first replacing the hard drive in the computer.