The computer boots up to a black screen with the message: “BOOTMGR is missing Press Ctrl+Alt+Del to Restart”. This error message more accurately means the computer “cannot find the boot entry point,” but the system is likely still running. In other words, it’s not a system crash, but rather a broken boot path. Below are effective repair methods for this black screen error : “BOOTMGR is missing, unable to enter the system”.
Method 1: Restart after unplugging the external device.
Some computers prioritize booting from: USB flash drive/external hard drive/SD card. If these devices contain boot information, the computer may fail to boot correctly.
Steps:
1. Shut down the computer;
2. Unplug all USB flash drives;
3. Unplug the external hard drive;
4. Unplug the card reader;
5. Reboot and test.
If it returns to normal, it means the boot sequence was interfered with by the external device.
Method 2: Check BIOS boot order
This step is crucial if you have recently replaced your hard drive or reinstalled your operating system.
Steps:
1. Press Del or F2 repeatedly during startup to enter the BIOS;
2. Locate the Boot menu;
3. Check the Boot Priority;
4. Confirm that the system drive is listed first;
5. Press F10 to save and exit.
If your computer has two hard drives: prioritize the hard drive where Windows is installed.
Method 3: Update the storage controller driver
Many users encounter BOOTMGR errors after upgrading to Windows 11, replacing their SSD, or updating drivers. Although the problem manifests as a boot failure, the root cause may be a faulty storage driver. After entering the system, you can use Driver Booster to perform a diagnostic scan. This software can automatically match hardware models and system versions, reducing boot failures caused by driver incompatibility issues.
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Downloads: 5,281,5931. Open Driver Life and click the “Diagnose Now” option on the “Full Diagnosis” interface;
2. The software will automatically detect the problems existing on the current computer. Users can click the “Full Repair” option to install drivers in batches and repair the problems existing on the computer.
Method 4: Use Windows Startup Repair
This applies to situations where boot files are corrupted due to sudden power outages, failed updates, or forced shutdowns.
Steps:
1. Boot from the Windows installation USB drive;
2. Click: Repair your computer;
3. Go to: Troubleshoot → Advanced options → Startup Repair;
4. Wait for the system to automatically detect and repair.
Restart your computer after the repair is complete.
Method 5: Rebuild the BOOTMGR boot file
If the repair process fails, you can rebuild manually.
1. Go to: Troubleshoot → Advanced options → Command Prompt
2. Execute the following commands sequentially.
3. After execution, restart your computer. This step can regenerate the Windows boot record
Method 6: Check for hard drive errors
If BOOTMGR occurs frequently, it may indicate a problem with the hard drive.
Enter the following command at the command prompt: chkdsk C: /f /r
Functions:
1. Repair file system errors;
2. Check for bad sectors;
3. Recover damaged indexes.
Scanning time may take several tens of minutes depending on the hard drive capacity.
If the above methods are ineffective, further checks can be made:
1. Whether the EFI partition is missing;
2. Whether the SSD has failed;
3. Whether the SATA data cable is damaged;
4. Whether the hard drive has bad sectors.
If the BIOS cannot recognize the hard drive, hardware failure should be checked first.
