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Windows recovery: start with the failure you can see

Choose the situation that matches the PC. A machine that does not power on, one showing No boot device, and one that crashes after the Windows logo need different checks.

Lees in het Nederlands →
  1. 1HardwareNo POST or display
  2. 2SSD / bootNo boot device
  3. 3Windows logoHangs or restarts
  4. 4UpdateProblem afterwards
  5. 5Offline repairInstallation reachable

Choose where startup stops

1

The PC does not complete hardware startup

No normal lights, fans, vendor logo or display? Check power, connections, display, memory and other hardware first.

2

The SSD is missing or you see ‘No boot device’

Check in UEFI that the SSD is detected consistently.

  • If the drive is missing or appears only intermittently, stop Windows repair and protect the data first.
  • If Windows is still present but Windows Boot Manager is missing or the boot configuration is damaged, continue with:

Repair EFI and BCD with BCDBoot →

4

The problem started directly after Windows Update

Check whether the update completed or stopped during installation.

  • A completed quality update that causes problems can often be rolled back first.
  • An interrupted update may require package-state or component repair before more packages are removed.

Remove a Windows update through WinRE or Windows PE →

5

Windows will not run but the installation is accessible

From Windows Recovery Environment or Windows PE you can inspect the installed Windows volume offline.

DISM checks and repairs the Windows image and component store. SFC checks protected system files against that store.

Repair Windows offline with DISM and SFC →

6

A cumulative update did not finish

If package state and logs point to an interrupted update and rollback does not restore a healthy previous state, verify release, architecture, build and any checkpoint prerequisites before applying a package offline.

Install a Windows update offline with DISM →

7

Stop code 0xC000021A

0xC000021A means Windows cannot continue because a critical process has terminated. The code does not identify one file, driver or update by itself.

Investigate stop code 0xC000021A →

Three checks before manual offline repair

1. Find the real Windows volume

diskpart
list volume
exit
dir C:\Windows
dir D:\Windows
dir E:\Windows

Use only a volume containing Windows, Program Files and Users. Do not assume Windows is still C: in recovery.

2. Check BitLocker

manage-bde -status

Do not change boot or partition settings while the Windows volume is locked and the recovery key is unavailable.

3. Watch the SSD

Stop if the drive disappears, reports I/O errors or becomes extremely slow during simple reads. Protect the data first.

Stop if

  • you cannot identify the Windows installation or partition confidently;
  • important data has no usable backup;
  • BitLocker cannot be unlocked;
  • the SSD shows signs of failure;
  • an update package cannot be matched exactly to the installed Windows version;
  • previous changes cannot be reconstructed;
  • malware has compromised trust in the existing installation.

Need help? Contact Forcys →