What desktop computer brands do you repair?

We repair all desktop brands including Dell, HP, Lenovo, Asus, Acer, Apple iMac, and all custom-built desktops. No brand is too obscure — if it has a power button, we can likely fix it.

Can you upgrade my desktop computer?

Yes. We perform RAM upgrades, SSD and hard drive upgrades, GPU upgrades, CPU upgrades, and power supply replacements for most desktop systems. We can significantly improve the performance of an older desktop at a fraction of a new computer's cost.

Do you repair custom-built PCs?

Yes. We diagnose and repair custom desktop PCs including gaming rigs, workstations, and home-built systems. We also help identify failing or incompatible components.

Desktop Computer Repair in Rancho Cucamonga

Professional desktop computer repair in Rancho Cucamonga for Dell, HP, Lenovo, Asus, Acer, Apple iMac, and all custom-built PCs. Our certified technicians diagnose and repair hardware failures, power issues, boot failures, performance problems, and software errors — with same-day service available and a 90-day warranty.

We repair all types of desktop computers: tower desktops, all-in-ones (AIO), mini PCs, gaming desktops, and workstations. Whether your desktop won't power on, has a failed hard drive, is running slow, or has a virus infection, Supreme Tech finds and fixes the problem at a transparent flat rate.

Desktop Repair Services

Power supply replacement — desktop won't turn on, no power, tripped breaker
CPU diagnostics and replacement — overheating, no POST, system instability
GPU (graphics card) repair and replacement — display issues, artifacting, no video
RAM upgrade and replacement — fix memory errors and slow performance
Hard drive and SSD upgrade — replace a failing drive, add storage, clone existing drive
Virus and malware removal — complete removal and security hardening
Windows 10 and 11 repair — boot failures, update errors, OS corruption
OS reinstallation — clean install with data backup and migration
Motherboard diagnostics and repair — POST failures, no-power, USB or audio port issues
Cooling system service — fan replacement, thermal paste, dust cleaning
Data recovery — recover files from failed desktop hard drives and SSDs
Custom desktop builds and component upgrades

Desktop PC Upgrade Services

Upgrading a desktop is often more cost-effective than buying new. Supreme Tech performs desktop PC upgrades that dramatically improve performance:

SSD upgrade — boot time drops from 60+ seconds to under 10 seconds
RAM upgrade — eliminate slowdowns when multitasking or running demanding software
GPU upgrade — improve graphics performance for gaming, design, or video editing
CPU upgrade — increase processing power for rendering or data-intensive tasks

Frequently Asked Questions

What desktop brands do you repair? All brands — Dell, HP, Lenovo, Asus, Acer, Apple iMac, and all custom-built gaming and workstation PCs.

Can you upgrade my old desktop? Yes. SSD upgrades, RAM increases, GPU replacements, and CPU upgrades are all available. Upgrading is often far cheaper than buying a new computer.

How long does desktop repair take? Most repairs are same-day. Hardware upgrades and OS repairs are typically done within a few hours.

Do you repair custom-built gaming PCs? Yes. We diagnose and repair custom gaming desktops and workstations including component identification, compatibility testing, and performance tuning.

Service Area

Desktop computer repair service for customers in Rancho Cucamonga, Ontario, Fontana, Upland, Claremont, and the greater Inland Empire.

Book Desktop Repair Call (840) 999-1034

📍 11830 Sebastian Way Ste 103, Rancho Cucamonga, CA 91730 · 📞 (840) 999-1034 · Mon–Sun 10 AM–6 PM