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It could be overheating, a driver or software problem, unstable power delivery—or something else. A freeze alone cannot identify the cause. First note whether Windows showed a stop screen, the display went blank while the PC stayed on, the whole system locked up, or power cut out abruptly. Then use the timing, any error message, and low-risk checks to narrow the possibilities before replacing parts or resetting Windows.
What kind of failure are you seeing?
These symptoms can look similar from across the room, but they point to different checks. Microsoft lists hardware, drivers, and software among possible causes of unexpected restarts and stop-code errors; the message and circumstances are clues, not a diagnosis.
- Stop-code screen followed by a restart: Record the stop code and any module shown beside “What failed.” Windows’ stop-code troubleshooting guidance uses these details to help narrow the issue, but a named module does not prove that component is defective.
- Blank display while the PC remains powered: Check the display connection and graphics-driver path. A blank screen does not by itself mean Windows or the entire PC has frozen. See Microsoft’s black or blank screen steps.
- Hard lock: If the image and input stop responding while the PC stays on, record what was running and whether it happens at idle or under load. A hard lock alone does not distinguish software from hardware.
- Abrupt power loss or restart: Note whether it follows heavy CPU or GPU use. Power connections, PSU protection, heat, and other faults may warrant investigation; the symptom alone does not establish that the PSU has failed.
Also write down whether the issue began after a Windows or driver update, new hardware, a particular app or game, or only after sustained use. A pattern helps prioritize checks but does not prove a cause.
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Could a driver or Windows problem be causing the freeze?
If the problem began after a driver, Windows, or hardware change—or Windows displayed a stop code—start with targeted software and device checks rather than changing several things at once.
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- Remove recently added hardware if the problem began after connecting or installing it, then check whether the symptom changes.
- Start Windows in Safe Mode to see whether the problem persists with a reduced set of drivers and services. Follow Microsoft’s stop-code troubleshooting steps for the applicable Windows version.
- Check Device Manager for warning icons. For a marked device, try updating its driver; if that does not help, consider disabling or uninstalling that device as Microsoft recommends. Keep the change targeted and note the device’s original state.
- Check Windows Update and install applicable updates. If the issue followed a graphics-driver change or involves a blank screen, use the graphics-device maker’s supported update or rollback process; Microsoft also lists graphics-driver reset and rollback among its blank-screen steps.
Choose recovery actions according to how disruptive they are. Microsoft’s Windows recovery options can involve data loss, so back up important files before using an option that may remove them.
Windows 10 support ended on October 14, 2025, according to Microsoft’s PC performance guidance. If you use Windows 10, account for that support status when deciding how to maintain the system; it does not, by itself, explain a freeze.
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When should you investigate overheating?
Cooling deserves attention when the fault follows sustained load, airflow is obstructed, or supported monitoring shows CPU throttling. Check that vents are clear and compare readings with the limits for the exact processor or computer model using its maker’s monitoring guidance.
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There is no single temperature cutoff established for every processor, laptop, desktop, sensor, and workload. Intel’s boxed-processor overheating guidance includes CPU throttling as evidence to consider 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.
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Do not open equipment beyond panels the manufacturer identifies as user-serviceable, or attempt a repair it does not support. If the system is under warranty or you are unsure how to proceed, use its manufacturer’s service guidance.
Could a failing power supply be responsible?
A PSU protection circuit can shut down power in response to abnormal voltage, current, temperature, short-circuit, or other power conditions. That explains one way a shutdown can happen; it does not identify whether the PSU, a connection, the load, or another component triggered it. CORSAIR describes these protection functions in its PSU protection guide.
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A PSU tester is an optional tool for a targeted check, not a conclusive test for every intermittent or load-dependent fault. CORSAIR’s power-supply testing guide also describes multimeter checks and warns that jumping the wrong pins can cause injury or damage. A fan spinning or a simple tester result does not rule out every fault.
Do not open or attempt to repair a PSU. CORSAIR’s PSU safety guidance warns of electric-shock risk and says the unit has no user-serviceable components. For modular PSUs, use only the cables supplied by that PSU’s manufacturer; modular cables are not necessarily interchangeable. If a test is beyond your experience, contact the manufacturer or a qualified technician.
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How do the symptoms compare?
| Observation | What to investigate | What it does not prove |
|---|---|---|
| Stop code or “What failed” module | Windows, driver, device, or software path; Safe Mode and Device Manager checks | That the named part alone is defective |
| Fault follows sustained load; throttling evidence | Cooling, airflow, and supported CPU temperature checks | That the CPU is the only heat source or fault |
| Abrupt power loss or restart, especially under load | Power connections, PSU protection, and appropriate manufacturer diagnostics | That the PSU must be replaced |
| Issue begins after a driver, Windows, or hardware change | Test or reverse the recent change in a controlled way | That the change is necessarily the sole cause |
| Blank display while the machine remains active | Display connection, graphics driver, app, or Windows recovery checks | That the entire PC has frozen |
What should you do before replacing parts?
- Record the exact failure behavior, any stop code or “What failed” name, what was running, and whether the fault follows sustained load.
- Check for a recent change and test it in a controlled, reversible way where possible.
- Use Windows and device-maker troubleshooting steps that match the symptom; avoid making multiple unrelated changes at once.
- For suspected heat or power issues, use model-specific monitoring and manufacturer diagnostics. Get qualified help rather than opening a PSU or attempting unsupported internal repairs.
Replace a PSU only after a fault is established. Before choosing one, confirm the computer’s form factor, power requirements, connectors, warranty status, and manufacturer guidance.
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