Windows Won't Boot? — Step-by-step startup & boot error fixes

Human-tested steps · Updated: Dec 09, 2025 · Works for Windows 10 & 11

If your PC powers on but doesn't go past the logo, shows a black screen, or gets stuck in an automatic repair loop — relax. Main ne ye steps simple rakhe hain, jaise main ghar ke kisi neighbor ko bataun. Follow them in order.

Quick table of contents

Initial checks (do first)

  1. Power & cables: Unplug power, wait 30s, plug back. Check power LED & battery (laptops).
  2. Peripherals: Disconnect USB drives, SD cards, external HDDs — system may try to boot from them.
  3. Listen for beep codes: If motherboard beeps, note pattern — it points to hardware issues.
  4. Try multiple restarts: 2–3 full shutdowns then start — sometimes Windows recovers itself.
Pro tip: If you recently installed new software or drivers and booting failed afterward, try to access recovery options (below) and uninstall that update.

Boot into Safe Mode / Windows Recovery

If Windows won't boot normally, force the recovery environment:

  1. Power on the PC and when Windows logo appears, hold the power button to force shutdown. Repeat 2–3 times until you see "Preparing automatic repair".
  2. Choose Troubleshoot → Advanced options → Startup Settings → Restart. Then press 4 or F4 for Safe Mode.
  3. In Safe Mode, uninstall recent drivers/apps or run virus scan.

Repair tools & commands (use carefully)

Open Command Prompt from Advanced options and try these:

1. Startup Repair

From Windows Recovery → Troubleshoot → Advanced options → Startup Repair. Let Windows try automatic fixes.

2. System File Checker & DISM

sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealth

Run SFC first; if it cannot fix files, run DISM and repeat SFC.

3. Repair boot records (when bootloader is corrupted)

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

Sometimes bootrec /fixboot returns 'Access denied' — in that case check disk encryption or OEM protections.

Hardware checks (if software fixes fail)

1. Check storage

An unhealthy HDD/SSD can stop boot. Run disk diagnostic from manufacturer tools, or use chkdsk C: /f /r if drive is accessible.

2. RAM test

Bad RAM can prevent boot. Run Windows Memory Diagnostic or boot MemTest86 from USB.

3. Try swapping components

If comfortable, test with another known-good drive, or remove one RAM stick at a time to isolate failing module (for desktops/laptops with removable RAM).

FAQ

Will these steps delete my data?

Most repair steps don't delete files. However, rebuilding the OS or replacing the drive requires backup. If possible, connect the drive to another computer and copy important files first.

What if PC shows a black screen with cursor?

Try Ctrl+Alt+Del — if Task Manager opens, you can restart explorer.exe or check startup apps. Otherwise try Safe Mode or boot from recovery USB.

Related: Fix Blue Screen (BSOD) · Speed Up a Slow PC

If you want, I can also provide a printable checklist (PDF) for these boot steps — upload and I’ll create it for you.