The power went out, the generator kicked in, or NEPA restored supply — and now your PC is behaving strangely. Or maybe you heard a pop, smelled something, and the PC died. Either way, you're wondering: was my PC damaged by that power event?
In Nigeria, this is one of the most common situations we deal with. The answer isn't always obvious, because power surge damage ranges from instant and catastrophic to slow, subtle, and cumulative. This guide helps you assess what happened and what to do next.
Immediate Signs of Serious Surge Damage
These signs indicate significant damage that requires immediate action — stop using the PC:
- Burning or electrical smell: A sharp, acrid smell near the PC case or the PSU (the rear of the case) strongly suggests a component burned out. This is often the PSU sacrificing itself to protect other components — or in a cheaper PSU, failing and potentially taking other parts with it.
- Visible burn marks: Open the case and look with a torch. Black scorch marks on the motherboard, capacitors with a brown crust or swollen tops, or melted plastic on cables indicate catastrophic failure.
- PC is completely dead: If the PC shows zero response — no fans, no lights, nothing — after a power event, the PSU has almost certainly failed. This is not necessarily the end of the story; a dead PSU often means the rest of the system is fine.
- Smoke or sparks: If you saw or smelled smoke during the event, shut everything down immediately and don't restart until a technician has assessed it.
Subtle Signs of Partial Surge Damage
These signs appear after a power event but aren't immediately dramatic. They indicate partial damage that will get worse over time:
- Random restarts or shutdowns that didn't happen before the event
- Blue screens with error codes like WHEA_UNCORRECTABLE_ERROR or MEMORY_MANAGEMENT
- USB ports no longer working — surge damage often kills USB controllers on the motherboard while leaving everything else functional
- One RAM slot no longer recognising RAM — motherboard RAM slots can be individually damaged
- Hard drive making new clicking or grinding noises — drives are particularly sensitive to power irregularities
- GPU producing artefacts (coloured pixels, lines, flickering) that weren't there before
- PC runs but runs hotter than usual — damaged voltage regulators can cause increased heat output
What to Test First
If your PC is still running after a power event but you're worried, here's what to check:
- Check all USB ports: Plug in a USB device to each port. Note which ones work and which don't. If some fail, the motherboard has likely suffered USB controller damage.
- Run a memory test: Use Windows Memory Diagnostic or MemTest86. RAM is one of the first things to be affected by surges.
- Check drive health: Run CrystalDiskInfo. Look at the Reallocated Sectors Count, Uncorrectable Sector Count, and overall health status. A sudden jump in these values after a power event confirms drive stress.
- Monitor temperatures: Use HWMonitor and run the PC under normal load for 30 minutes. Compare temperatures to what you knew before — significantly higher temperatures can indicate VRM damage.
- Check Event Viewer: Open Event Viewer and look at Windows Logs → System. Filter for Critical and Error events in the last 24 hours. A surge often leaves a trail of hardware errors in the logs.
The PSU: First Line of Defence (and First to Die)
A quality PSU is designed to absorb a surge and fail rather than passing damage to your other components. If your PSU died during a power event, this may have saved your motherboard and GPU. This is why the type of PSU you have matters enormously in Nigeria. A dead PSU is often a sign of a PSU doing its job.
Before replacing a dead PSU, verify the motherboard is functional: try a known-good PSU or have a technician test it. Many times, we see systems where only the PSU failed and everything else is perfectly fine.
When to Worry About Data
If the power went out while the PC was writing to the hard drive or SSD, there is a risk of file system corruption even without physical hardware damage. If Windows is acting strangely after a power cut (slow startup, files missing, applications crashing), run CHKDSK on your drives first: open Command Prompt as administrator and run chkdsk C: /f /r. It will prompt you to schedule a scan on next restart.
What to Do Right Now
If you're reading this after a recent power event: stop using the PC for anything critical, back up your files to an external drive or cloud service immediately while the system is still running, and get a proper diagnostic done. Partial damage has a way of becoming total failure under continued use.
We carry out detailed post-surge diagnostics and component replacement — often we can recover a system for a fraction of the cost of a new build.