Blue Screen & Boot Loop Repair — Laptop or PC Won’t Start Properly (All Brands)

If your laptop or PC powers on but won’t load properly — showing a Blue Screen of Death, restarting in an endless boot loop, or getting stuck on “Preparing Automatic Repair” — this is almost always a software or startup fault, not a power problem. The device itself is turning on fine; it’s Windows or macOS that can’t finish loading. This is not a brand-specific issue: we see it just as often on Dell, HP, Lenovo, Acer, Asus, Toshiba, Samsung, Apple MacBook, Microsoft Surface, Alienware, MSI, and custom-built desktop PCs. Below we explain the symptoms, what you can safely try at home, the likely causes, and how our engineers diagnose and repair it — usually without losing any of your files.

📞 Skip the troubleshooting — talk to an engineer now: 020 7018 7490

Common Blue Screen & Boot Loop Symptoms

These are all software-level startup faults — the device powers on, but something stops Windows or macOS from loading normally:

Blue Screen of Death (BSOD)

A blue error screen appears during or shortly after startup, often with a stop code.

Stuck on Logo or Boot Loop

The brand or Windows logo appears, then the device restarts itself, repeatedly.

“Preparing Automatic Repair” Loop

Windows tries to repair itself on every boot but never actually completes.

“Automatic Repair Couldn’t Repair Your PC”

Windows gives up trying to fix itself and leaves you at a recovery menu.

Black Screen With Just a Cursor

Windows loads to a plain black screen with only a mouse pointer visible, going no further.

Stuck on Loading Spinner

The circling dots or spinner runs indefinitely and never reaches the desktop.

Stop Code Errors

Messages such as INACCESSIBLE_BOOT_DEVICE, CRITICAL_PROCESS_DIED, or SYSTEM_THREAD_EXCEPTION.

“Operating System Not Found”

The device can’t locate a bootable operating system on the drive at all.

Only Boots Into Safe Mode

Windows will only load in Safe Mode and crashes or freezes on a normal startup.

Possible Reasons Your PC Won’t Boot Properly

Since the device is powering on, the fault almost always lies within the software layer rather than the hardware itself:

  • Corrupted system files — core Windows or macOS files have become damaged and can no longer load correctly.
  • Failed or incomplete Windows update — an update that didn’t finish installing can leave the system unable to boot.
  • Corrupted boot sector, MBR, or BCD — the small piece of data that tells the drive how to start Windows has become damaged.
  • Faulty or conflicting driver — a recently updated or incompatible driver can crash the system on every startup.
  • Malware or virus infection — malicious software can corrupt startup files or block Windows from loading normally.
  • Failing hard drive or SSD — file system corruption or early drive failure can prevent the operating system from being read correctly.
  • Recently installed software or hardware conflict — a new program, driver, or peripheral can interfere with the boot process.
  • Interrupted shutdown or forced power-off — repeatedly cutting power during shutdown or updates can corrupt system files over time.

Things You Can Safely Try at Home First

These steps are safe to try yourself and can resolve some software boot faults without needing a repair:

  • Try to boot into Safe Mode (hold Shift while restarting, or interrupt startup 2–3 times to trigger recovery options) to see if the system loads with minimal drivers.
  • If a System Restore point exists from before the problem started, use it to roll Windows back to a working state.
  • Try Startup Repair from the Windows Recovery Environment (accessible from the same recovery menu as Safe Mode).
  • If you recently installed new software, a driver, or a Windows update, try uninstalling it from Safe Mode or via System Restore.
  • Disconnect any recently added external devices (USB drives, docks, printers) and try restarting.
  • Write down the exact stop code or error message shown on the blue screen — this speeds up diagnosis significantly, whether at home or with us.

⚠️ When to Stop and Bring It to Us Instead

  • You’ve tried the steps above and the device is still stuck on the same error, screen, or loop.
  • You see disk errors, “Operating System Not Found,” or repeated CHKDSK prompts — this can point to a failing drive that needs urgent attention.
  • You have important data that isn’t backed up — avoid reinstalling or resetting Windows until it’s been recovered.
  • You suspect malware or a virus is involved.
  • You’re being prompted to download or run unfamiliar “repair” or “fix” tools from the internet — these are frequently unsafe and can make the problem worse.

Our Blue Screen & Boot Diagnostic Process

Once your device is with us, our engineers follow a structured process to identify and fix the exact software fault:

  • Stop code & error analysis — identifying the exact Windows or macOS error to narrow down the cause.
  • Disk health check — confirming whether the hard drive or SSD itself is healthy or beginning to fail.
  • Malware and virus scan — ruling out or removing any malicious software affecting startup.
  • Driver and update rollback — reverting recent changes that may have triggered the fault.
  • Boot file and system repair — rebuilding corrupted boot sectors, registry entries, or system files where needed.
  • Data-safe reinstall if required — if a full operating system reinstall is genuinely necessary, we back up your files first and always confirm with you before proceeding.

Your Data Stays Our Priority

In most blue screen and boot loop cases, your files on the drive are completely intact even though Windows can’t load. We always prioritise recovering and backing up your data before any repair, reset, or reinstall. If the drive itself has failed, our dedicated data recovery service can help retrieve your files.

📞 Call us now for more info on: 020 7018 7490

Why Choose PC Fix London

Walk in

No appointment is needed.

No Fix, No Fee

If we can’t repair it, you don’t pay for the attempt.

Fixed Price Quote

You’ll know the full cost before any work begins.

All Brands & Models

Windows laptops, MacBooks, desktops — all covered.

15+ Years Experience

Trusted London repair specialists since day one.

Warranty Included

Every repair is backed by our workmanship warranty.

Three Easy Ways to Book Your Repair

🏬 Drop-In

Visit our Kings Cross shop and speak to an engineer directly.

📦 Courier Collection

We arrange collection of your laptop or PC from your door.

📍 Address: Sinclair House, Thanet Street, Kings Cross, London WC1H 9PZ
🕒 Hours: Monday – Friday, 10:00 – 18:00
📞 Phone: 020 7018 7490

Frequently Asked Questions

Why does my laptop show a blue screen when I turn it on?

A Blue Screen of Death (BSOD) during startup is almost always a software or driver-level fault rather than a hardware failure. Common causes include a failed Windows update, a corrupted system file, a faulty driver, malware, or a failing hard drive or SSD reporting file system errors. The exact stop code shown on the blue screen helps us pinpoint the cause quickly.

My laptop is stuck in a boot loop, restarting over and over. What’s wrong?

A boot loop is usually caused by a corrupted operating system file, a failed update that didn’t complete properly, a damaged boot configuration, or conflicting startup software. The laptop itself is powering on correctly, but Windows or macOS cannot finish loading, so it keeps restarting.

What does “Preparing Automatic Repair” or “Diagnosing your PC” mean?

This is Windows’ built-in recovery tool trying to fix a startup problem automatically. If it loops endlessly or ends with “Automatic Repair couldn’t repair your PC,” it usually means the boot files, registry, or a system driver are corrupted beyond what the automatic tool can resolve on its own, and manual repair is needed.

Is a blue screen or boot loop a sign of a dying hard drive?

It can be, but it isn’t always. Many blue screens and boot failures are caused purely by software or driver corruption with a perfectly healthy drive underneath. We run a full disk health check as part of every diagnostic to confirm whether the drive itself is failing or whether it’s a software-level fault.

Will I lose my files if my PC won’t get past a blue screen or boot loop?

In most software-related boot faults, your files on the drive are untouched even though Windows can’t load. We prioritise recovering your data before any reinstall or repair, and only proceed with your permission if a full system repair or reinstall becomes necessary.

Can I fix a blue screen or boot loop myself?

Some basic steps such as booting into Safe Mode or using System Restore are safe to try yourself. Repeatedly force-restarting the device, running unfamiliar ‘fix’ tools from the internet, or attempting a full reinstall without backing up your data first can make things worse, so we recommend professional diagnosis if the basic steps don’t resolve it.

How much does it cost to fix a blue screen or boot problem?

Software and boot repairs are typically more affordable than hardware repairs, since no parts are usually required.

Do you fix blue screen and boot problems on all brands?

Yes. Blue screens, boot loops, and startup repair failures are software issues that affect Windows and macOS devices regardless of manufacturer, and we repair them on Dell, HP, Lenovo, Acer, Asus, Toshiba, Samsung, Apple MacBook, Microsoft Surface, Alienware, MSI, and custom-built desktop PCs.

Still not sure what’s wrong? Call us on 020 7018 7490 and describe the error message or symptom — our engineers can often narrow down the likely cause over the phone before you even bring the device in.