🖥️ Desktop Computer Not Turning On? Here's What Might Be Causing It

You hit the power button… and nothing happens. No lights, no fans, no startup sound. If your desktop computer won’t turn on, don’t panic — there are several reasons this could be happening, and most are fixable.

At Gary’s Computer Repair Service, we help diagnose and fix desktop boot issues for homes and businesses across Dublin and beyond. Let’s look at the common causes and what you can do.

⚡ Common Reasons a Desktop Won’t Turn On

1️⃣ Power Supply Failure (PSU)
The power supply is one of the most failure-prone parts in a desktop. If it's dead or faulty, your system won't get any power.

2️⃣ Faulty Power Button or Cable
Sometimes the problem isn’t inside the computer — it could be a broken power button, a disconnected cable, or even a bad wall socket.

3️⃣ Motherboard or RAM Issues
A damaged motherboard or improperly seated RAM can stop your PC from booting or cause it to power on with no display.

4️⃣ Graphics Card or Peripheral Short
Loose or faulty components (like the graphics card, hard drive, or USB devices) can cause short circuits or prevent startup.

5️⃣ Dust & Overheating Shutdowns
If your PC was shutting down frequently before, it could be clogged with dust and refusing to power on as a safety measure.

🛠️ What We Do to Fix It

✅ Full Power & Hardware Diagnosis
We test your PSU, motherboard, RAM, and all key connections to isolate the problem.

✅ Power Button & Wiring Checks
We inspect your front-panel connections and replace faulty power switches if needed.

✅ Component Re-seating & Replacement
We re-seat RAM, GPUs, and clean contacts. If needed, we replace or upgrade damaged components.

✅ Dust Removal & Cooling Repair
We give your desktop a full internal clean, replace thermal paste, and ensure proper airflow.

✅ Data Protection
If we can’t repair the desktop immediately, we help you retrieve important files from the hard drive.

💼 We Repair All Brands & Builds

• Dell, HP, Lenovo, Acer, ASUS

• Custom gaming PCs

• Office workstations

• Windows & Linux systems