⚡ Diagnose Power Supply Problems

Hard30-45 minutesHardware Diagnostics & Repair

Last updated: October 7, 2025

Identify PSU failures and test your power supply safely.

Overview

PC not turning on or randomly shutting off? Could be the power supply.

What makes a problem look like it’s the power supply specifically

This is different from a PC that shows absolutely no sign of life at all — this is about a PC that does turn on and generally runs, but shuts down unexpectedly under load, restarts on its own, or occasionally refuses to power on, patterns that point toward the component feeding power to everything else rather than a single dark screen.

The power supply is the one piece nearly everything else in the PC depends on, so when it’s struggling to deliver steady power — especially when demand spikes, like during a game or a heavy task — the symptoms can look like almost anything else is wrong, which is exactly why this is so often misdiagnosed as something unrelated.

How to tell it's this

How serious is it?

Usually minor

An occasional restart under heavy load, with no other symptoms, isn’t automatically alarming on its own — a lot of things beyond the power supply can cause it.

Worth taking seriously

A burning smell, a pop, or repeated total power failures are the signs worth stopping and treating carefully rather than continuing to use the PC as normal.

Why guessing at hardware causes here is riskier than a software fix

Symptoms that point toward power delivery can also be caused by several other things entirely — overheating, a different failing component, or even a software issue — and mistaking one for another means spending money or effort on the wrong thing, or in this case, working inside the PC unnecessarily.

Narrowing down whether the pattern you’re seeing genuinely points to power delivery before anything gets opened up or replaced is what WindowsHelper is being built to help with.

What this helps with

What to expect: Hard difficulty • usually about 30-45 minutes.

Topics covered
power supplypsuno powerrandom shutdownburning smellvoltage

This is one of 61 Hardware Diagnostics & Repair fixes in the WindowsHelper library. The full step-by-step fix for this is in the WindowsHelper app.

Coming soon in the app

The full step-by-step fix for this is in the WindowsHelper phone app — coming soon, no price announced yet. The free PC Companion (available now) is the piece that connects your phone to your PC.

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Common questions

Is my power supply definitely the problem if my PC restarts during games?
Not necessarily — that pattern is a genuine clue worth paying attention to, but overheating and other components can produce similar symptoms, so it’s worth narrowing down rather than assuming.
Is it dangerous to keep using my PC if I suspect this?
If there’s been a burning smell or a pop, that’s worth stopping for right away. Occasional restarts alone are more of an inconvenience to sort out than an immediate danger, though they’re worth addressing.
Could this be caused by something I added to my PC?
It can be — new components draw additional power, and if the timing lines up with when the symptoms started, that’s a meaningful clue worth following.
Will I lose my files if this is what’s wrong?
Files stored on your drive are generally separate from what’s happening with power delivery, so this kind of issue on its own doesn’t typically put them at risk.

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