How to check a PC after a power outage

A sudden power outage can leave your PC unable to start, cause an error on the next boot, or interrupt files that were being saved. If it starts normally, you may still want to check that its main hardware responds as expected.

Start with a quick safety check, then use Test Everything to run the available browser-based checks step by step and get a report. A browser test can help spot symptoms, but it cannot confirm that every part is undamaged.

Check the PC safely

Look and listen before turning it on. Check the power cable, outlet, power strip, and computer case for damage, a burning smell, liquid, or unusual sounds. If you see or smell signs of damage, leave the PC unplugged and skip the tests.
Start the PC once. Connect it to a known-working outlet and switch it on. Note whether it starts normally, shows an error, shuts off, or makes a new noise. Avoid repeated power cycling if it will not start.
Save important files. If Windows loads and the PC behaves normally, copy important documents to a separate drive or trusted backup location before running tests. Do not use the computer for valuable work if files are missing or the drive is making unusual noises.
Run the checks. Open Test Everything and follow its steps. Read the report for checks that did not complete or results that differ from what you expect. Stop if the PC becomes unusually hot, unstable, or noisy.

If the PC will not boot, do not keep restarting it to reach the browser test. Check the power connection and display connection once, then use the troubleshooting steps below or contact a repair professional.

What the result means

The PC starts and the checks complete normally

This is reassuring: the parts checked by the browser responded during the test. It does not prove that files are intact or that the power supply and motherboard have no hidden damage. Keep your backup current and watch for later shutdowns, errors, or changes in performance.

A test reports a problem or will not complete

Read the report alongside what you noticed. A test may be unavailable because of browser limits, permissions, or the device, not because hardware failed. If the same symptom occurs in normal use, repeat only that relevant check after restarting once, and compare the result.

Windows shows a repair or recovery screen

The outage may have interrupted a system update or file write. Follow the recovery options shown on screen, and avoid interrupting a repair that is already running. If Windows keeps returning to recovery, prioritize copying or recovering important files before attempting resets or reinstallations.

The PC shuts off, makes a new noise, or smells burnt

Stop using it and disconnect power if you can do so safely. A browser report cannot rule out a damaged power supply, a loose connection, or another electrical fault. Do not open the power supply case.

How to fix common problems

Check the outlet and power connections. Make sure the power cable is firmly seated at both ends. If the outlet or surge protector may be affected, test with a known-working outlet, but do not use one that is hot, damaged, or sparking.
Disconnect nonessential accessories. Turn the PC off and unplug USB devices, external drives, and hubs. Start it with only the essentials connected. If it starts, reconnect one device at a time to see whether a peripheral or cable is involved.
Check Windows for pending recovery or updates. If Windows starts, open Settings › Windows Update and check whether an update is waiting to finish. On a Mac, open System Settings › General › Software Update. Do not force shutdown while an update or recovery process is actively working.
Check for file errors before making big changes. If a document or application reports an error, make a backup of files that still open. Avoid factory resets, formatting, or reinstalling the operating system until important data is safe.
Review power protection for next time. A surge protector can reduce some electrical surges, but it does not keep a PC running during an outage. A battery backup, also called a UPS, can provide time to save work and shut down cleanly. Follow the manufacturer's instructions when connecting one.
Ask for repair help if startup remains unreliable. If the PC repeatedly shuts off, cannot start, or shows new electrical symptoms, stop testing it. A repair technician can inspect the power supply and internal connections safely.

When the PC may need repair

One outage does not automatically mean the computer is damaged. Get professional help if it will not power on after you have checked the outlet and cable, shuts off under light use, has a burning smell, or makes a new clicking or buzzing noise. If it is under warranty, contact the manufacturer before opening the case. Never open a power supply, even when it is unplugged, because parts inside can retain dangerous electrical charge.

What a browser check cannot confirm

Test Everything runs checks through the browser. It cannot inspect the power supply internally, verify that every file survived the outage, or guarantee the computer will remain stable under every workload. A normal result is useful evidence, not a full electrical or data-integrity inspection.

If the PC is stable, back up important files and keep an eye out for repeat symptoms over the next few days.