A friend's desktop computer powers off unexpectedly at seemingly random times, and afterward it sometimes won't boot again for several hours. The issue happens even when the PC is connected directly to a wall outlet, so a power strip doesn't appear to be the only factor. The power supply was replaced last year. What should we check first to identify the cause?
3 Answers
More information is needed before narrowing this down: the CPU and graphics card models, power supply model and wattage, operating system, whether it happens during gaming or while idle, and whether the PC shows any lights or fan movement after shutting down. Windows Event Viewer may record a sudden power loss, but an unexpected-shutdown entry usually confirms only that power disappeared rather than identifying the failed part.
A shutdown followed by a long period where the computer won’t power on can also point to a failing power supply, motherboard, loose power connection, or even a defective case power button. Replacing the PSU last year doesn’t completely rule it out, especially if the replacement is low quality or another component is causing protection circuitry to trip. Check the internal power connectors and try another known-good power cable if available.
Overheating is one of the most likely explanations. A failing or clogged CPU cooler, case fans, or graphics card can cause the system to shut itself down, and it may refuse to start until the temperature drops. Have her power it off, unplug it, clean out the dust with short bursts of compressed air, and confirm that all fans spin normally. She should avoid opening the case while it is powered and should hold fans still while cleaning them.
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