0x0000007B (0xf78a2524, 0xC0000034, 0x00000000, 0x00000000) error after installation of new RAM

I am getting the BSOD upon startup with the STOP: 0x0000007B (0xf78a2524, 0xC0000034, 0x00000000, 0x00000000) message. The machine is a Dell Dimension 8400. I installed new ram to find this message and have tried switching the ram back to the old with the problem still persisting.


Very good chance you loosened a cable or connection when you were replacing the

Check with Dell Support, their on-line documentation and drivers, and ask in the Dell
forums for known issues.

Dell Support

Dell Drivers - Product Manuals & Warranty Info (left side) - Tech Support and more

Dell Forums


Check the disk for malware :

Make a Bootable CD with the Trinity Rescue Kit - free - which comes with 5 antivirus programs
built-in - Hirem's is another choice - others can be found using Google.

Trinity Rescue Kit - Download on upper right of page

Hirem's Boot CD is another good choice


You could also back up the data and re-install Windows 7. The hard drive can be put into
another computer as 2nd drive (best) or into an External USB case. Either would allow
you to copy the data to removable media such as CD, DVD, or other USB drives.

Or you could use an Ubuntu boot CD to back up the data.

Use Ubuntu Live CD to Backup Files from Your Dead Windows Computer


For more troubleshooting :

BCCode: 7B    0x0000007B  <-- read this link

The INACCESSIBLE_BOOT_DEVICE bug check has a value of 0x0000007B. This bug check indicates that the Microsoft Windows operating system has lost access to the system partition during startup.

Important Information If You Have Received a STOP Code

If you have received a blue screen error, or stop code, the computer has shut down abruptly to protect itself from data loss. A hardware device, its driver, or related software might have caused this error. If your copy of Windows came with your computer, call the manufacturer of your computer. If you purchased Windows separately from your computer, Microsoft provides support. To find contact information for Microsoft or your computer manufacturer Contact Support.

If you have experience with computers and want to try to recover from this error, follow the steps provided in the Microsoft article Resolving STOP (Blue Screen) Errors in Windows.

The following actions might prevent an error like this from happening again:

  1. Download and install updates and device drivers for your computer from Windows Update.
  2. Scan your computer for computer viruses.
  3. Check your hard disk for errors.

The INACCESSIBLE_BOOT_DEVICE bug check frequently occurs because of a boot device failure. During I/O system initialization, the boot device driver might have failed to initialize the boot device (typically a hard disk). File system initialization might have failed because it did not recognize the data on the boot device. Also, repartitioning the system partition or installing a new SCSI adapter or disk controller might induce this error.

This error can also occur because of incompatible disk hardware. If the error occurred at the initial setup of the system, the system might have been installed on an unsupported disk or SCSI controller. Some controllers are supported only by drivers that are in the Windows Driver Library (WDL). (These drivers require the user to do a custom installation.)


This error always occurs while the system is starting. This error frequently occurs before the debugger connection is established, so debugging can be difficult or impossible.

Resolving a failed boot device problem: If a boot device is at fault, you must edit the boot options.For more information about changing these options, see Configuring Software on the Target Computer.

Resolving an incompatible disk hardware problem: If Setup autodetects the controller, you might have to skip detection and use a specific manufacturer's disk to load the driver. Also, check the availability of updates for the system BIOS and SCSI controller firmware. Updates of this kind are typically available on the Web site or BBS of the hardware manufacturer.

Remove any recently added hardware, especially hard disk drives or controllers, to see if the error is resolved. If the problematic hardware is a hard disk drive, the disk firmware version might be incompatible with your version of the Windows operating system. Contact the manufacturer for updates. If you removed another piece of hardware and the error is resolved, IRQ or I/O port conflicts likely exist. Reconfigure the new device according to the manufacturer's instructions.

Confirm that all hard disk drivers, hard disk controllers, and SCSI adapters are listed in the Microsoft Windows Marketplace Tested Products List.

If you recently added a driver, restart your computer, and press F8 at the character-based menu that displays the operating system choices. In the Advanced Options menu, select the Last Known Good Configuration option. This option is most effective when you add only one driver or service at a time.

In addition, check your computer for viruses by using any up-to-date, commercial virus scanning software that examines the Master Boot Record of the hard disk. All Windows file systems can be infected by viruses.

This error can also occur because of hard disk corruption. Run Chkdsk /f /r on the system partition. You must restart the computer before the disk scan begins. If you cannot start the computer because of the error, use the Recovery Console and run Chkdsk /r.

If you cannot start the system in the last known good configuration, you should try to start off the Windows CD. Then, you can run Chkdsk from the Repair Console.

Warning   If your system partition is formatted with the FAT file system, the long file names that the Windows operating system uses might be damaged if you use Scandisk or another MS-DOS-based hard disk tool to verify the integrity of your hard disk drive from MS-DOS. Always use the version of Chkdsk that matches your version of Windows.

If your system has SCSI adapters, contact the adapter manufacturer to obtain updated Windows drivers. Try disabling sync negotiation in the SCSI BIOS, checking the cabling and the SCSI IDs of each device, and confirming proper termination. For IDE devices, define the onboard IDE port as Primary only. Also check each IDE device for the proper master/subordinate/stand alone setting. Try removing all IDE devices except for hard disks. Finally, check the System Log in Event Viewer for additional error messages that might help identify the device or driver that is causing the error.

BCCode: 7B    0x0000007B  <-- read this link


If you do not have a Windows 7 disk you can borrow a friends as they are not copy
protected. Your System maker will also sell the physical DVD cheap since you already
own Windows. Also you can make a repair disk on another computer.

Try Startup Repair - (If at ANY point you gain some but not full access to Windows come
back and try Startup Repair again.)

How to Boot to the System Recovery Options in Windows 7

What are the system recovery options in Windows 7?

Try StartUp Repair from Recovery Options or Windows 7 disk.

How to Run a Startup Repair in Windows 7

Also from the COMMAND PROMPT of Recovery Console (if possible) or a Windows 7 disk

Start - type in Search box -  COMMAND   find at top of list -  RIGHT CLICK  -  RUN AS ADMIN

sfc /scannow

How to Repair Windows 7 System Files with System File Checker

Then run checkdisk (chkdsk).

How to Run Disk Check in Windows 7

Retry Startup Repair after Chkdsk.

If needed after those you can try System Restore from Safe Mode or the Recovery or Windows 7

How to Do a System Restore in Windows 7


If you need to make repair disks - these help repair Windows not re-install.
Often a Repair Disk will help when the Recovery Disk does not - Use OPTION 2 to
make the disk.

How to Create a Windows 7 System Repair Disc


If needed :

What to do if Windows won't start correctly

How to Boot to the System Recovery Options in Windows 7

What are the system recovery options in Windows 7?

How to Do a Repair Install to Fix Windows 7

Hope this helps.

Rob Brown - past Microsoft MVP - Windows Insider MVP 2016 - 2021
Microsoft MVP Windows and Devices for IT 2009 - 2020

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Question Info

Last updated January 17, 2021 Views 3,818 Applies to: