Whether your PC has suddenly stopped working or has been misbehaving for weeks, common PC problems are usually identifiable — and most have straightforward solutions. As Edinburgh's local PC repair specialists, we see the same issues come through our door time and again. Here's a rundown of the problems we encounter most frequently, along with practical advice on what to do.
1. The PC Won't Turn On
A machine that shows no signs of life is alarming, but the cause is often simpler than you'd expect. Start by checking the basics:
- Is the power cable firmly connected at both ends?
- Is the wall socket switched on and working?
- For laptops: is the charger actually providing power, or has the charging port come loose?
- For desktops: has the power supply unit (PSU) failed?
If the power light comes on briefly before switching off, or if you hear a series of beep codes, the issue is likely a hardware fault — a failed component, a RAM stick that has come loose, or a dead motherboard. These are best diagnosed professionally rather than guessed at. If you're unsure, book a diagnostic and we'll pinpoint the fault for you.
2. Blue Screen of Death (BSOD)
The infamous blue screen — formally known as a Stop Error — appears when Windows encounters a critical problem it cannot recover from. A one-off BSOD after a power cut is nothing to worry about. But if you're seeing them repeatedly, something is wrong.
Common culprits include:
- Faulty or incompatible RAM — running a memory diagnostic can confirm this
- Driver conflicts — especially after a Windows Update or a new hardware installation
- Overheating — the system shuts itself down to prevent damage
- Failing hard drive or SSD — particularly if the error code mentions a disk issue
Note the stop code shown on the blue screen (e.g. MEMORY_MANAGEMENT, CRITICAL_PROCESS_DIED) — this tells a technician exactly where to look first.
3. PC Overheating and Shutting Down
Computers are designed to shut themselves down when they get too hot, which is far preferable to permanent damage. If your PC is switching off mid-use — especially during demanding tasks like gaming or video editing — overheating is a likely cause.
The most common reason is a build-up of dust inside the case, particularly around the CPU cooler and case fans. Over time, dust forms a thick layer that traps heat. Cleaning the internals with compressed air can make a dramatic difference. If the PC still overheats after cleaning, the thermal paste on the CPU may have dried out, or the cooling fan itself may have failed.
Our hardware service includes thermal paste replacement and cooling system checks for exactly this kind of issue.
4. Extremely Slow Performance
A PC that has become painfully slow is one of the most common complaints we hear. Before assuming the worst, try these steps:
- Check how much free storage is left — Windows struggles when a drive is nearly full
- Open Task Manager and look for any processes consuming an unusually high percentage of CPU or memory
- Check how many programmes are set to run at startup
- Run a virus scan — malware frequently causes sluggish performance
If none of those help, the issue may be a failing hard drive, insufficient RAM for modern software, or a Windows installation that has become corrupted over time. Upgrading from an old spinning hard drive to an SSD is often the single most impactful improvement you can make. We cover this in more detail in our guide to speeding up a slow Windows PC.
5. No Display — PC Powers On But Screen Is Blank
If your computer appears to start up — fans spin, lights come on — but the monitor stays black, the problem could be in several places:
- A loose or faulty display cable (HDMI, DisplayPort, or VGA)
- The monitor itself, which you can test by connecting a different screen
- A failed graphics card — especially if the fans on a dedicated GPU are not spinning
- A RAM issue causing the system to fail before the display initialises
On a desktop, try reseating the RAM and graphics card. On a laptop, a blank screen often points to a failed display panel or a loose ribbon cable — both of which are covered by our screen replacement service.
6. PC Freezing or Locking Up
Random freezes — where the screen locks completely and the cursor stops moving — are frustrating and disruptive. The cause is usually one of the following:
- Insufficient RAM — particularly when running several applications at once
- A failing storage drive — the system freezes while waiting for data that the drive struggles to deliver
- Software conflicts or a corrupted Windows installation
- Overheating (see point 3 above)
Running the built-in Windows Memory Diagnostic and CHKDSK tool can help identify RAM or drive issues. If freezes happen frequently and the cause isn't obvious, a professional diagnosis is worth the time — intermittent faults can be tricky to pin down.
7. Strange Noises From the PC
Computers should be relatively quiet in normal operation. If yours has started making unusual sounds, pay attention:
- Clicking or grinding — almost always a failing hard drive. Back up your data immediately and replace the drive.
- Loud whirring — a fan working overtime due to heat, or a fan bearing that is wearing out.
- Rattling — a loose cable, a screw, or a fan blade catching on something inside the case.
- High-pitched whine — can indicate a power supply issue or electrical interference from a component.
Clicking or grinding from a hard drive is a serious warning sign — read more in our hard drive data recovery guide. If you hear it, contact us promptly — our data recovery service has a much higher success rate when a drive hasn't been run to complete failure.
When to Seek Professional Help
Many PC problems can be diagnosed at home using the steps above. But if you've worked through the basics and the issue persists — or if you're not comfortable opening up your machine — it's time to bring in a professional. Attempting a repair without the right knowledge or tools can occasionally turn a fixable problem into a much more expensive one.
At PC Repair Services Edinburgh, we offer a thorough diagnostic service covering all of the problems described above. Whether you drop your machine in to us or prefer a home callout, we'll identify the issue and give you a clear assessment before any work begins.
You can also take a look at our full range of repair and upgrade services to see how we can help get your computer running as it should.