For more detailed troubleshooting paths, consult the Microsoft Learn Advanced Troubleshooting for Windows Startup Issues guide.
To perform advanced repairs, you must boot from the Windows Server 2012 R2 installation media: Insert the installation disc or mount the ISO. Press any key when prompted to boot from CD/DVD. Select language/keyboard preferences and click Repair your computer (bottom-left corner). Navigate to Troubleshoot Advanced Options Command Prompt Microsoft Community Hub 3. Repairing the Bootloader (BCD/MBR)
UEFI systems do not use a standard MBR. Instead, they rely on an EFI System Partition (ESP) formatted in FAT32 to hold the boot files. You must manually assign a drive letter to this hidden partition to rebuild it. Open the disk utility again: diskpart Use code with caution. windows server 2012 r2 boot repair
When the Command Prompt opens, the drive letters may shift. The system drive (where Windows is installed) might not be C: .
Before diving into advanced recovery tools, a simple but often effective step is to try the (LKGC). This option starts your server using the last registry and driver configuration that successfully booted the system. It is useful for undoing recent driver installations or registry changes that caused the boot failure. To access it, restart your server and repeatedly press the F8 key before the Windows logo appears. From the Advanced Boot Options menu, select "Last Known Good Configuration (advanced)". Instead, they rely on an EFI System Partition
Navigate to the EFI directory and use the bcdboot tool to point the system back to the Windows directory (usually on the C: drive):
If your server boots up but continuously crashes, gets stuck on a spinning wheel, or reenters an "Automatic Repair" boot loop, the boot configuration itself might be working fine while the underlying system binaries are corrupted. Run System File Checker (SFC) Offline C: is the offline Windows directory
If you encounter an error code not listed here or a repair step fails, leaving your server in an unbootable state, please provide the specific error message or the point of failure for further, targeted assistance.
Disclaimer: Some of these procedures involve low-level disk operations. Ensure you have backups before proceeding.
(In this example, C: is the offline Windows directory, and D:\sources\install.wim represents the installation media source package). Troubleshooting Advanced Errors Total Identified Windows Installations: 0
c: cd boot attrib bcd -s -h -r ren bcd bcd.old bootrec /rebuildbcd Use code with caution.
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