Windows Server 2012 R2 Boot Repair «QUICK | 2026»

| Error Code | Likely Cause | Quick Fix Method | |------------|--------------|------------------| | 0xc000000e | BCD corruption | Method 2 | | 0xc000000f | Bootmgr missing | Method 2 (fixboot) | | 0xc0000225 | Partition issues | Method 2 + diskpart active partition | | 0xc000021a | Registry corruption | Method 4 | | INACCESSIBLE_BOOT_DEVICE | Storage driver | Method 7 | | 0xc0000034 | Boot file missing | Method 2 (rebuildbcd) |

Whether you are facing the ominous "INACCESSIBLE_BOOT_DEVICE" blue screen, a black screen with a blinking cursor, or the frustrating automatic repair loop, this guide provides a systematic, step-by-step methodology to diagnose and repair boot issues on Windows Server 2012 R2.

bootsect /nt60 sys /mbr A corrupted SYSTEM registry hive breaks boot with errors like 0xc000021a or 0xc0000034 . The recovery environment allows you to replace it with a backup copy.