Desktop PC Repair & Custom Builds in London

Repairs, upgrades and custom builds for every kind of desktop — brand towers, self-built rigs, gaming machines and workstations. Diagnosed first, priced before we start.

Desktop PC repair at Fixfactor, London
Walk-in · Wimbledon Mail-in · UK wide Up to 12-month warranty Tested, proven parts

Repairs

Something is broken or worn out.

Upgrades & Servicing

Make the machine you have faster, cooler and quieter.

Custom Builds

A new PC, specified around what you will do with it.

Software & Data

It powers on, but it will not behave.

Know the fault, but don’t see it listed? Describe it and we’ll price it from your description — free, no device needed. Not sure what’s wrong? That’s what the Diagnostics Service above is for.

More than one machine to look after? We service business and school fleets in batches, with collection, return and a single invoice. Business repairs

Common Desktop PC Repairs

From no power and overheating to motherboard, Windows and graphics faults — we diagnose the cause first and explain the best-value fix.

Desktop graphics card diagnostics at the Fixfactor workshop

Graphics Card Assessment

Cleaning, paste and pads, cooling and liquid-damage work — tested under load, temperatures logged before and after. If the card is not worth saving, you will hear that first.

No power at all

PSU, switch or board — tested under load, not guessed.

Overheating & dust

Deep clean and fresh paste, temperatures measured before and after.

Technician testing a desktop PC motherboard with a multimeter

Board, CPU or power?

We find which part actually failed, then price the fix or the swap — whichever is the sensible bill.

Slow PC

Usually the old hard drive. An SSD transforms the same machine.

No display

GPU, cable, memory or board — diagnosed in order.

Boot loops & Windows

Blue screens and stuck updates, fixed without touching your files.

Something else?

Coil whine, dead front-panel USB, a first build that will not POST — describe it and we will price it.

PC Types We Repair

We repair custom-built PCs, gaming PCs, brand towers, all-in-ones and workstations. Choose yours to see the faults we handle most often.

Any combination of parts, any age

We repair PCs built by you, a friend or another shop. No manual or original parts list is needed — we diagnose the hardware in front of us.

What we see most on these

  • A new build that will not POST
  • Random restarts under load — usually power or thermals
  • The upgrade that never quite worked since fitting

Not listed? We still repair it — tell us what you have.

We Build Custom PCs for Your Needs

Tell us what you need the PC to do and your budget. We select compatible parts, send you the complete specification for approval, then build, cable and stress-test the finished machine.

Technician installing a graphics card into a custom desktop PC
How we build a custom PC Your needs determine the parts, power and cooling, followed by stress testing. Your needs Choose parts Power & cooling Stress test

Gaming PCs

Specified around the games and the monitor you actually play on — the budget goes where the frames come from, and the cooling keeps it quiet at 10pm.

AI & LLM Workstations

Local model work needs VRAM, memory bandwidth and sustained-load stability. We build and burn-in machines that run for days, not benchmarks that run for minutes.

Video & Photo Editing

Fast scratch storage, dependable colour output, and quiet under render — storage laid out for projects, not just capacity.

Quiet Office PCs

Small, silent and dependable. The machine you forget is on — which is the point.

Need a complete new PC or already have the parts? We can specify and build the whole machine, or assemble, cable and test the components you bring us.

PC Upgrades and Servicing

Practical ways to improve, maintain or repair the desktop PC you already own.

Desktop PC case with power supply, liquid cooler and memory ready for a compatible upgrade

PC Upgrades

We upgrade RAM and memory, SATA SSD and NVMe storage, graphics cards, power supplies, processors and cooling. Before recommending parts, we check the motherboard, case space, power requirements, BIOS support and the hardware already fitted.

If a new build is better value, we will say so before anything is ordered. Where the old drive is already failing rather than simply full, the job becomes data recovery and we stop before anything is overwritten.

Heavy dust build-up on the radiator, fans and graphics card inside a desktop PC tower

PC Cleaning and Cooling Service

We remove dust from fans, vents and heatsinks, renew thermal paste or pads where appropriate, and check cables and airflow. Temperatures are tested under load before and after the service, so the result can be measured rather than guessed.

The aim is a cooler, quieter PC with less throttling and fewer heat-related shutdowns.

All-in-one desktop PC running Windows with keyboard and mouse after a software repair

Windows and Software Repair

We troubleshoot Windows startup faults, crashes and blue screens, driver problems, malware, software conflicts and slow systems. Your files and settings are protected wherever possible, and we also check the hardware when the symptoms overlap.

You get a clear explanation of what is software-related, what is hardware-related and what is worth fixing.

Examples of Desktop PC Work

Four jobs from the Wimbledon workshop — what we were asked for, and how we went about it.

Custom Build

I need somewhere to keep 256TB, and it has to run around the clock.

What we didFar more drive capacity than a normal case, power supply or airflow plan can carry. We specified the chassis, power and cooling around the drive count rather than the processor, then built the machine and burned it in under sustained load.

OutcomeDelivered stable, and still running.

AI Workstation

It runs local AI models fine for a minute, then falls over.

What we didStable at idle, unstable within minutes of real work — the signature of cooling and power sized for a benchmark rather than for a sustained all-core, all-GPU load. We rebuilt the cooling and gave the power real headroom.

OutcomeTested across a full working day at full load, then handed back.

Repair

It was fine yesterday. Today there are no lights and no fans at all.

What we didThe power supply had failed without taking anything with it, which is the answer you want. We test the unit under real load and check the board before condemning either, so nobody pays for a part that was never broken.

OutcomeNew supply sized for the machine, back the next working day.

First Build

I built it myself and it will not start. Have I killed something?

What we didAssembled, powered up, no display and no error beep. Working through it in order rather than swapping parts, the fault was in how the board was mounted and wired — nothing that needed buying.

OutcomeFixed the same day, with an explanation of what to check next time.

Ways to Use Our Service

Two ways to get your desktop PC repaired — bring it to Wimbledon, or post it from anywhere in the UK.

In Person

  1. 1

    Bring It to Wimbledon

    136 Kingston Road. Walk in, or book a slot if you would rather not wait.

  2. 2

    We Find Out What Is Wrong

    You get the price and the timescale before anything is touched.

  3. 3

    We Repair It

    Only once you have said yes. Parts in stock can be the same day; board work takes longer.

  4. 4

    Collect It

    We call when it is ready. Tested, and under warranty.

UK Wide

  1. 1

    Tell Us the Fault

    Describe it on the form. We reply with an estimate and how to send it.

  2. 2

    Post It to Us

    Pack it well. Include the charger if it will not charge.

  3. 3

    We Confirm Before We Start

    If it turns out not to be worth repairing, we say so and stop there.

  4. 4

    Back to You, Tracked

    Returned insured and tracked, under the same warranty.

Why Choose Fixfactor for Your Desktop PC

We have repaired devices from our Wimbledon workshop since 2014 — more than 220,000 of them. Desktops are repaired, upgraded and built on the same bench, by the same technicians, which is why we can tell you which of the three your machine actually needs.

Every job starts with a diagnosis rather than a parts list. The suspect hardware is tested under real load, we check what your board, case and power supply can take, and you get a written price before anything is ordered. Nothing starts without your approval, and the £39 diagnostics fee comes off the repair when you go ahead.

The part people remember is what we say when a repair is not the answer. Desktop parts are standard and comparatively cheap, so we will often tell you that replacing the failed component — or putting the money towards a new build — beats the more impressive job, even when the component-level repair we do daily on laptops and phones would technically be possible. We would rather lose the job than sell you one that will not hold.

Adam, Fixfactor technician in Wimbledon, testing a motherboard under the microscope with a multimeter probe
12+years in Wimbledon
220,000+devices repaired

What Customers Say

Every repair carries a warranty. These are unedited reviews left on Google and Trustpilot.

4.9 ★★★★★1,000+ reviews on Google & Trustpilot

For Business

PC Repairs and Builds for Businesses

We work with repair shops, IT companies, offices and schools.

Board-Level Work

Microsoldering and data recovery for the jobs you outsource.

Advanced Repairs

Fleet Repairs and Builds

Batch repairs, servicing and identical builds. One invoice.

Business Services

Trade pricing, direct contact with the technician, and agreed turnaround times.

Good to Know

The questions we are asked most about desktop PC repairs.

Not answered here? Ask us — we reply the same working day.

Is my desktop PC worth repairing?

Usually, yes — a desktop is a sum of replaceable parts, so one failed component rarely condemns the machine. Diagnostics is £39, tells you exactly what is wrong with a written repair price, and the fee is credited when you go ahead. If the honest answer is to put the money towards a new build instead, that is what we will tell you.

How long does a desktop PC repair take?

Parts jobs are usually same or next working day when the part is in stock — memory, storage, power supplies, cleaning and thermal work. Diagnostics takes one to three working days. Motherboard and graphics work takes two to five, because it is bench time under a microscope rather than a swap. Every service listed above shows its own turnaround, and you get the timescale with the quote rather than after.

What is included in the £39 diagnostics?

A full assessment on the bench rather than a guess at the counter: power supply outputs measured under load, motherboard rails checked, memory and storage tested, graphics exercised, temperatures logged, and Windows checked for faults that only look like hardware. You get a written diagnosis and a fixed price for the repair. The fee comes off that repair when you go ahead, and if the machine is not worth fixing we say so and tell you which parts are worth carrying into the next one.

Do you repair graphics cards?

The work that reliably pays off is thermal and liquid: deep cleaning, fresh paste and thermal pads, fan and cooling repair, and liquid-damage cleaning — each with temperatures measured before and after, so you can see what changed. Component-level repair of the GPU itself is a different proposition. Success rates are low, the specific components are hard to source, and the bench hours mount up, so on most cards the money is better spent on a replacement — and that is what we will tell you after the assessment. On high-value cards, where the owner understands the odds and accepts the time and the cost, we will make the attempt.

Is it worth repairing a desktop motherboard?

Usually not, and we would rather tell you that than sell you the repair. Desktop boards are standardised, widely available and comparatively inexpensive, and they are not the most common failure in the first place — a dead machine is more often the power supply, the memory or the processor. What is worth paying for is finding out which of those it actually is: we test them in order, then quote the replacement of the part that failed. Component-level board repair is something we do daily on laptops and phones, where a new mainboard costs more than the machine; on a desktop it rarely adds up, and we only suggest it where the board is unobtainable, such as an older brand tower or a workstation.

How much does desktop PC repair cost?

It depends on the part, which is why the pricing above is split honestly: fixed prices where the job needs no parts, and a from-labour figure elsewhere with the parts priced after diagnosis. Either way you confirm the full quote before any work starts, and nothing is ordered until you do.

Do you repair liquid-damaged PCs?

Yes — spills over a tower or an all-in-one, and cards or boards that have had a drink. Unplug it and do not try to power it on: what usually finishes a board is current running through wet traces, not the liquid itself. We strip it down, clean and treat the corrosion, then test and tell you honestly what survived. You get that verdict, and a price, before any repair goes ahead.

I built the PC myself — will you still work on it?

Yes, and it is some of our favourite work. No receipts, manuals or parts list needed; we diagnose the hardware in front of us, whether it is self-built, a boutique build or a prebuilt gaming tower. First-build faults usually come from a short list — memory seating, front-panel wiring, a CPU power cable left unplugged, a misplaced standoff — and we tell you what it was, so the next build goes smoother. No judgement; everyone has been there.

Can you build me a custom PC?

Yes. Tell us what the machine is for and roughly what you want to spend, and we specify it around the workload rather than around a parts list. You approve the full specification before anything is ordered. Build labour starts at £150 with parts quoted separately, and the finished machine is cable-managed, stress-tested and covered by our workmanship warranty. Already bought the parts? We will assemble, cable and test them.

Can you build a PC for running local AI models?

Yes — it is one of the builds we are asked for most. Local model work is bounded by VRAM first, then by memory bandwidth and by whether the machine stays stable for hours rather than minutes, so the specification looks different from a gaming PC at the same budget. We size cooling and power for sustained full load and burn the machine in before it leaves.

What warranty do you give on repairs and builds?

Up to twelve months on repairs, covering the part we fitted and the work we did. Custom builds carry our workmanship warranty, and the components keep their own manufacturer warranties registered in your name. If something we touched fails inside the period, bring it back and we will put it right.

Should I bring the monitor and cables in too?

Just the tower — leave the monitor, keyboard, mouse and cables at home, we have everything on the bench. Two exceptions: bring the power brick with an all-in-one, and for a graphics-card-only job you can bring just the card.

Do you repair PCs on-site, or for businesses and schools?

Consumer repairs are workshop-based, and deliberately so: the microscope, the thermal camera and the test benches are here, which makes a tower cheaper and better repaired in Wimbledon than on a desk. For businesses and schools we do work on-site and in batches — collection, return and a single invoice, with volume pricing and one contact. Describe the fleet on the quote form and we will come back with numbers.

Get a Quote

We price this one individually — what it takes varies from device to device, so we look before we quote.

Tell us what the device does and we’ll price it from your description. No need to bring it in for this.

You’ll normally hear back the same working day. If you don’t, give us a ring on 020 8543 7088 — it means something has gone astray.

Thanks — we have your request. We’ll come back to you with a price, usually the same working day.