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Windows Won't Boot: How to Fix Startup Problems

7 min read

Windows won't start, gets stuck on logo, or loops back to error screen? Step-by-step fixes for startup failures — from Startup Repair to rebuilding the bootloader.

A PC that won't boot is alarming but usually fixable. The approach depends on how far Windows gets before failing — here's how to diagnose and fix each scenario.

Identify Where It Fails

  • No POST, black screen — hardware issue (RAM, GPU, power)
  • BIOS shows, then black screen — bootloader missing or corrupt
  • Windows logo appears, then restarts — driver or system file corruption
  • Spinning dots freeze — update stuck or driver conflict
  • Blue screen on boot — driver or hardware failure
  • Login screen, then crash — user profile or driver issue

Access Windows Recovery Environment

Most fixes happen in the Recovery Environment (WinRE).

If Windows starts repair automatically: After 2–3 failed boots, Windows shows Automatic Repair screen → click Advanced options

Force it manually: Interrupt boot 3 times: press power button during Windows logo to force off, repeat 3 times. Windows detects this and boots into recovery.

From installation USB: Boot from Windows USB → Repair your computer → Troubleshoot → Advanced options

Fix 1: Startup Repair

WinRE → Troubleshoot → Advanced options → Startup Repair

Windows automatically scans for and fixes common boot problems. Takes 5–15 minutes. Try this first.

Fix 2: Rebuild Bootloader (BCD)

If Windows can't find the boot configuration:

WinRE → Command Prompt:

bootrec /fixmbr
bootrec /fixboot
bootrec /scanos
bootrec /rebuildbcd

Run in this order. When rebuildbcd asks to add Windows to boot list — press Y.

If bootrec /fixboot returns "Access is denied":

bcdedit /export C:\BCD_Backup
attrib C:\boot\bcd -h -r -s
ren C:\boot\bcd bcd.old
bootrec /rebuildbcd

Fix 3: System File Repair

Corrupt system files prevent boot:

WinRE → Command Prompt:

sfc /scannow /offbootdir=C:\ /offwindir=C:\Windows
DISM /Image:C:\ /Cleanup-Image /RestoreHealth

Fix 4: Roll Back a Bad Update or Driver

If Windows stopped booting after an update:

WinRE → Troubleshoot → Advanced options → Uninstall Updates → Uninstall latest quality update

Or roll back a driver via Command Prompt:

# List installed drivers
dism /image:C:\ /get-drivers

# Remove a specific driver
dism /image:C:\ /remove-driver /driver:oem5.inf

Fix 5: System Restore

If you have restore points:

WinRE → Troubleshoot → Advanced options → System Restore → pick a date before the problem started

This undoes system changes without affecting personal files.

Fix 6: Safe Mode

If Windows partially boots, try Safe Mode to isolate the problem:

WinRE → Troubleshoot → Advanced options → Startup Settings → Restart → press F4 for Safe Mode

In Safe Mode: uninstall recently added software or drivers, run sfc /scannow, or roll back drivers via Device Manager.

Fix 7: Disable Driver Signature Enforcement

If a recently installed unsigned driver is causing the crash:

WinRE → Startup Settings → Restart → press F7 (Disable driver signature enforcement)

If Windows boots — the unsigned driver is the problem. Remove it via Device Manager in Safe Mode.

Fix 8: Reset Windows

If nothing else works:

WinRE → Troubleshoot → Reset this PC → Keep my files → Cloud download

This reinstalls Windows while keeping personal files. Apps and settings will be lost.

Hardware Checks

If software fixes don't work, the problem may be hardware:

# Check disk from WinRE Command Prompt
chkdsk C: /f /r

# Check disk health
wmic diskdrive get status

RAM issues: remove one stick at a time, try booting with each individually.

Loose connections: reseat RAM, GPU, and storage cables.

Black Screen With Cursor

Windows loaded but display isn't working:

  • Press Ctrl + Alt + Del — if Task Manager opens, it's a shell/explorer issue
  • In Task Manager → File → Run new task → explorer.exe
  • Or try: Win + R → explorer.exe

If that doesn't work, boot into Safe Mode and check display drivers.

🔍 Не знаєш що означає код помилки Windows?

Якщо Windows показує код на кшталт 0x80070005, 0x80070002 або 0xC000021A — скористайся безкоштовним інструментом:

→ Декодер помилок Windows — введи код і одразу дізнайся що він означає та як виправити.

Summary

Try in order: Startup Repair → rebuild BCD → SFC/DISM → System Restore → uninstall recent updates → Safe Mode to remove bad drivers → Reset as last resort. For BSOD on boot: note the stop code and fix the specific driver or component named.

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