Can you fix Windows 11 that won't start?

Yes. We repair Windows 10 and 11 startup failures caused by corrupted system files, failed updates, boot sector damage, and driver conflicts — in most cases restoring normal function with data preserved.

Can you reinstall Windows without losing my data?

In most cases, yes. We back up accessible data before reinstalling the operating system. For drives that can still be read, we preserve your files and transfer them to the reinstalled system.

Can you fix a Mac that won't start?

Yes. We repair macOS startup failures including Recovery Mode issues, APFS corruption, failed macOS updates, and Apple Silicon startup problems.

timing depends on diagnosis, parts availability, repair complexity, and device condition

Data Preserved

Operating System Repair in Rancho Cucamonga

Computer won't boot? Getting a blue screen or startup error? Supreme Tech repairs Windows and macOS operating system failures in Rancho Cucamonga — restoring your computer without losing your data.

Call (840) 999-1034 Schedule Drop-Off

timing depends on diagnosis, parts availability, repair complexity, and device condition90-day limited parts and labor warranty where applicableData Preserved

OS Repair Services

From boot failures to full OS reinstalls, we handle all operating system problems on Windows and Mac.

OS Reinstallation

Fresh Windows or macOS installation to resolve deep corruption, persistent errors, or performance problems that can't be fixed otherwise.

Boot Repair

Computer won't start? We repair the Master Boot Record (MBR), UEFI bootloader, and boot configuration files to restore your system.

System File Repair

Corrupted system files cause crashes, errors, and instability. We use SFC, DISM, and other tools to find and repair damaged OS files.

Startup Error Repair

Blue screens, boot loops, error codes, and recovery mode failures — we diagnose and fix all types of Windows and macOS startup problems.

Driver & Update Repair

A bad Windows update or corrupt driver can break your system. We roll back, repair, or reinstall problematic updates and drivers.

Data Preservation During Repair

We back up your data before OS repair or reinstallation so your files, photos, and documents are safe throughout the process.

Symptoms of OS Failure

These are the most common signs that your operating system needs professional repair.

Computer gets stuck on startup screen

Windows or macOS boot loop that won't stop

Blue Screen of Death (BSOD) on startup

Black screen after Windows update

Operating system shows 'missing or corrupt' errors

Computer keeps restarting automatically

Applications crash immediately after opening

Startup repair or recovery mode doesn't fix the issue

Why Choose Supreme Tech for OS Repair

Walk-in OS repair in Rancho Cucamonga

Data backup before any repair or reinstallation

Support for Windows 10, Windows 11, and all macOS versions

90-day limited parts and labor warranty on eligible repairs; exclusions apply

Root cause analysis included — not just a quick fix

Turnaround depends on diagnosis and parts availability for most OS repairs

Frequently Asked Questions

Will I lose my data if the OS is reinstalled?

Not necessarily. We back up your data first and attempt repair without reinstallation. If a clean install is required, we migrate your files before and after.

How long does OS repair take?

Simple repairs take 1–2 hours. A full OS reinstallation with data migration typically takes 3–5 hours. We'll give you a realistic time estimate before starting.

Can you repair a macOS that won't boot?

Yes. We repair macOS boot issues including startup failures, disk permission errors, APFS corruption, and problems related to macOS updates.

What causes OS corruption?

Common causes include failed updates, power outages during updates, malware, bad sectors on the hard drive, and abrupt shutdowns. We identify the root cause so it doesn't happen again.

My computer was working fine and then a Windows update broke it. Can you fix that?

Yes. We can roll back the problematic update, repair the damage it caused, or reinstall Windows while preserving your files.

Related Services

Windows Repair macOS Repair Blue Screen Repair Virus Removal

Computer Won't Start? We Can Fix It.

Walk in or call ahead. OS repair service available in Rancho Cucamonga — data preserved.

Request Repair Call (840) 999-1034