It could be any of them—but a freeze alone cannot identify the cause. First determine whether Windows showed a stop-code screen, the display went blank while the PC stayed on, the computer locked up, or power cut out abruptly. Then match the pattern to targeted, low-risk checks before replacing parts or resetting Windows.
What kind of failure are you seeing?
Windows lists hardware, drivers, and software among possible causes of unexpected restarts. The visible symptom helps narrow the possibilities, but it is not a diagnosis. Note what the PC was doing, whether the issue began after a change, and any error information shown.
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- Stop-code screen followed by a restart: Record the stop code and any module named under “What failed.” Microsoft says these clues can help narrow the issue, but they do not prove that the named component is defective. Microsoft’s stop-code troubleshooting guidance covers Windows 10 and Windows 11.
- Hard lock: The display and input stop responding while the PC remains powered. Note whether it happens at idle, in a particular app or game, or after sustained CPU or GPU load.
- Blank screen: The display goes dark, but the machine may still be running. Check the display connection and graphics-driver path rather than assuming the entire PC has frozen. Microsoft’s blank-screen guidance includes connection, Safe Mode, and graphics-driver checks.
- Abrupt loss of power or restart: This makes power delivery worth investigating, especially if it occurs under load, but does not establish that the PSU is at fault.
Also record whether the problem began after a Windows or driver update, new hardware, or a change to the PC. A timing pattern is useful evidence, not proof that the change caused the fault.
What the symptoms suggest—and what they do not
| Observation | Worth investigating | Does not prove |
|---|---|---|
| Stop code or “What failed” module | Windows, driver, device, or software path | That the named part alone is defective |
| Problem follows sustained load; CPU-throttling evidence | Airflow, cooling, and supported temperature monitoring | That the CPU is the only heat source or fault |
| Abrupt power loss or restart, particularly under load | Power connections, PSU protections, and appropriate diagnostics | That the PSU must be replaced |
| Problem starts after a driver, Windows, or hardware change | A controlled test or reversal of that change | That the change is necessarily the sole cause |
| Blank display while the PC remains active | Display connection, graphics driver, app, or Windows recovery steps | That the whole PC has frozen |
Check Windows, drivers, and recent changes
For a Windows 10 or Windows 11 stop-code issue, Microsoft recommends removing recently added hardware, trying Safe Mode, checking Device Manager for warning icons, and checking for Windows updates. If a device is marked, try updating its driver; if that does not help, consider disabling or uninstalling that device. Keep the change targeted and note its original state so you can reverse it.
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- Remove a recent hardware addition: Disconnect recently added hardware if it is safe to do so, then see whether the symptom changes.
- Try Safe Mode: Use it to check whether the issue persists with a limited set of drivers and services. Follow Microsoft’s instructions for starting Windows in Safe Mode.
- Check Device Manager: Look for warning icons. Test the affected device’s driver update first; disable or uninstall it only as a targeted next step if updating does not help.
- Check Windows Update: Install relevant available updates, then observe whether the failure changes.
- If the issue followed a graphics-driver change: Use the PC or graphics-device maker’s supported update or rollback process. For a blank screen, Microsoft also lists resetting the graphics driver and checking connections among possible steps.
Use Windows recovery options only after less disruptive checks. Microsoft warns that some recovery options can cause data loss, so back up important files before using them. See Windows recovery options for the available choices and their effects.
When overheating is a plausible cause
Cooling deserves attention when the problem appears after sustained load, the PC’s vents are obstructed, or supported monitoring shows CPU throttling. Check that airflow openings are clear and use the monitoring method recommended by the computer maker. Compare readings with the limits for the exact processor and device.
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There is no single temperature cutoff that applies to every processor, laptop, desktop, sensor, and workload. Intel’s boxed-processor overheating guidance discusses CPU throttling and recommends undoing recent changes that may have caused overheating. For an OEM laptop or prebuilt desktop, Intel directs users to the computer manufacturer for overheating support. Do not open equipment beyond normal user-serviceable panels or attempt a repair the maker does not support.
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How to investigate a possible PSU problem safely
A PSU’s protection circuits can shut it down in response to abnormal voltage, current, temperature, a short circuit, or other power conditions. That explains how a shutdown can happen, not what triggered it: the PSU, the load, a connection, or another component may be involved. CORSAIR describes these protection mechanisms in its PSU protection guide.
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A PSU tester is an optional tool for a targeted check, not a conclusive way to rule out intermittent or load-dependent faults. CORSAIR’s PSU testing guide also describes multimeter checks and warns that jumping the wrong pins can cause injury or damage. A spinning fan or a basic tester result alone does not establish that a PSU is healthy under every condition. Follow the exact manufacturer’s instructions; if you are unsure, use manufacturer support or a qualified technician.
Do not open the PSU case or attempt to repair it. CORSAIR warns of electric-shock danger and says the unit has no user-serviceable components in its PSU safety guidance. For a modular PSU, use only cables supplied by that PSU’s manufacturer; do not mix modular cables.
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Choose the next step from the evidence
- Stop code or named module: Start with the Microsoft Windows, Safe Mode, and Device Manager checks; treat the code as a lead, not a parts-replacement instruction.
- Load-related symptoms or throttling: Check airflow and supported cooling diagnostics for the specific machine and processor.
- Abrupt shutdown: Note whether it recurs under load and seek manufacturer or qualified service guidance for power-delivery checks before buying a PSU.
- Failure after a change: Test or reverse that change in a controlled way, keeping a record of what you altered.
- Blank display with the PC still active: Follow the display and graphics-driver path rather than treating it as a confirmed system-wide lock.
If you use Windows 10, factor its support status into longer-term decisions: Microsoft says Windows 10 support ended on October 14, 2025. Its PC performance guidance reflects that status.
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