Don’t replace a component just because Windows crashes. A blue-screen stop code can point to a hardware problem, a driver, or software; the code is a clue, not a parts list. Record what happened, undo recent changes, check drivers and Windows diagnostics, and protect your files before trying recovery. If the crash continues, take that evidence to the PC maker or a qualified repair technician.
1. Record the crash and what changed
Write down the exact stop code and any module named after “What failed.” Note what you were doing when the crash occurred and whether it began after installing an app, driver, Windows update, or new device. Microsoft says these details can help narrow down causes, but no stop code alone identifies a component that should be replaced. See Microsoft’s stop-code troubleshooting guidance.
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If the blue screen disappears too quickly to read, use a phone to photograph it the next time it appears. Keep a short timeline of crashes and changes; whether the problem occurs only during a particular task can also be useful evidence for support.
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2. Undo or isolate recent changes
Test newly added hardware
If crashes started soon after you connected or installed a device, shut down the PC, disconnect or remove that device, and check whether the problem returns. Change one thing at a time so you can tell whether the result followed that change.
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Use Safe Mode if Windows is unstable
If Windows will not restart reliably, try starting in Safe Mode and continue with the checks you can perform there. Safe Mode loads a limited set of files and drivers, which can help distinguish a problem associated with a recent device or driver from one that also occurs in a minimal startup. Microsoft includes Safe Mode in its stop-code troubleshooting steps.
3. Check drivers, updates, and free space
Look for a device warning
- Open Device Manager and look for devices marked with an exclamation point.
- For a suspect device, try updating its driver. If that does not help, Microsoft suggests disabling or uninstalling the device as a troubleshooting step.
- Restart and see whether the crash recurs before making another change.
For WHEA_UNCORRECTABLE_ERROR, Microsoft advises trying drivers offered through Windows Update first. If no suitable driver is available there, or the update does not resolve the problem, check the device manufacturer’s site. Although this error is hardware-associated, its name does not by itself tell you which part—if any—needs replacement. See Microsoft’s WHEA_UNCORRECTABLE_ERROR guidance.
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Install available Windows updates
Check Windows Update for available updates as part of the basic troubleshooting process. Menu names and Settings paths can vary between Windows 10 and Windows 11 releases; use Windows Settings search for “Windows Update” if the path on your PC differs. Microsoft’s general stop-code guidance includes checking for updates.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsCheck the system drive’s free space
Microsoft gives 10% to 15% free space as a general suggestion, while noting that the exact requirement varies with system configuration. Treat this as guidance rather than a guaranteed threshold or a diagnosis of the crashes. The figure is from Microsoft’s undated stop-code troubleshooting page.
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4. Check Windows logs and memory diagnostics
Review Event Viewer
Open Event Viewer and inspect the System log for critical errors at roughly the time of a blue-screen crash. A nearby entry may help establish what Windows recorded, but a log entry is evidence to share—not proof on its own that a particular part failed.
Run Windows Memory Diagnostic
Run Windows Memory Diagnostic, then check Event Viewer for the result entry. A diagnostic result can add evidence to your timeline; a clean result should not be treated as proof that every hardware problem has been ruled out. Microsoft describes Event Viewer and the memory diagnostic in its blue-screen troubleshooting guidance. Memory-dump analysis is a more advanced route intended for IT professionals and developers.
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5. Make sure it is a stop-code crash
A blank or black screen without a stop code is a different symptom and should follow a different troubleshooting path. Microsoft notes that the timing and details matter: a cursor on a blank screen can relate to a stalled Windows process or driver; a blank screen at sign-in can involve display output or a profile; and a blinking cursor can indicate that UEFI/BIOS cannot find a boot device. Use Microsoft’s blank-screen troubleshooting guide for those cases rather than treating them as ordinary blue-screen crashes.
6. Back up before recovery, then choose the least disruptive option
Before trying a recovery option that could remove files, back up important documents, photos, and other data you cannot replace. An external SSD is one possible place to store a backup; it is for protecting files, not a fix for crashes.
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Microsoft recommends starting with the least disruptive recovery option that applies and warns that some options can cause data loss. If the crashes began after an update, uninstalling that update may help. Review Microsoft’s Windows recovery options before proceeding, and check the option’s effects for your Windows version.
7. When to ask for hardware support
If the same crash continues after you have isolated recent changes, checked drivers and updates, reviewed logs, and run memory diagnostics, bring the evidence to your PC manufacturer or a qualified repair technician. Include:
- The stop code and any “What failed” module name.
- When the crashes happen and what changed beforehand.
- Relevant System log entries and the Windows Memory Diagnostic result.
- The PC make and model, plus the devices involved in the troubleshooting.
That information can help support decide what to test next. The stop code alone—and even a hardware-associated code—does not establish which component to buy.
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Microsoft states that Windows 10 support ended on October 14, 2025. After that date, Windows 10 devices no longer receive free software updates through Windows Update, technical assistance, or security fixes. This lifecycle note is specific to Windows 10; see Microsoft’s Windows Update Troubleshooter page for its support notice. Windows 10 and Windows 11 labels and Settings paths can differ by release.
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