A failing power supply unit (PSU) is one of the most frustrating PC issues. It can cause random restarts, system instability, or complete failure to power on. The worst part? It often hides in plain sight.
Here are five telltale signs your PSU might be on its last legs – and what you can do about it.
⚡ 1. Random Reboots or Shut Downs
If your PC randomly turns off or restarts without warning, a dying PSU could be the culprit. This often happens under load (gaming, rendering, etc.) when the power supply can’t keep up.
✅ Fix: Swap in a known working PSU or use a PSU tester.
👉 Get a Power Supply Tester on Amazon📢 2. Strange Noises (Buzzing or Clicking)
Unusual noises coming from your PSU could mean coil whine or failing internal components.
✅ Fix: If under warranty, RMA the unit. Otherwise, consider replacing it to avoid damage to other components.
🔥 3. Burning Smell or Visible Smoke
If your PSU smells like burning plastic or emits smoke – shut it off immediately. This is a major fire hazard.
✅ Fix: Unplug everything and replace the PSU right away.
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📊 4. Inconsistent Voltages or Boot Errors
A PSU that’s failing may output fluctuating voltages, causing boot errors, freezes, or crashing under load.
✅ Fix: Use HWMonitor or BIOS to check voltages. Look for values too far off the 12V, 5V, or 3.3V rails.
🔍 5. Nothing Happens When You Press Power
If your PC does absolutely nothing when you press the power button (no fans, lights, or beeps), your PSU might be dead.
✅ Fix: Test with another PSU or a power supply tester before replacing.
💼 Final Thoughts
The PSU is often overlooked until it fails. But a dying PSU can take other components with it, so it’s smart to watch for signs early and act fast.
Need help choosing a replacement? Check out our Best Budget Gaming PC Build Under €500 for affordable and reliable PSU suggestions.
✉ Got a weird PSU story or question? Drop it in the comments!
Disclaimer: As an Amazon Associate, we earn from qualifying purchases. Always double-check compatibility and wattage before buying a new PSU.
