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A Blue Screen of Death (BSOD) is a Windows stop-error state: when a serious problem makes Windows shut down or restart unexpectedly, it stops rather than keep running in an unstable condition. The screen is a symptom, not a diagnosis; its stop code and any “What failed” name may help narrow down the cause.
What does BSOD mean?
BSOD is short for “Blue Screen of Death.” Microsoft also calls the event a bug check, STOP code error, or kernel error. In plain terms, Windows has encountered a serious system problem and stopped or restarted unexpectedly to protect itself from data loss. Microsoft Support describes the error and its terminology.
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What can cause a stop error?
Possible causes include hardware, a device driver, or software. The screen does not, by itself, prove which component is at fault. A stop code—such as PAGE_FAULT_IN_NONPAGED_AREA—or a module listed after “What failed” is a clue to investigate, not a guaranteed identification of the defective part. Microsoft explains the clues shown on blue-screen errors.
Some codes are more specific. For example, Microsoft says WHEA_UNCORRECTABLE_ERROR appears when a hardware error occurs on a Windows device. That description applies to this particular code; it should not be generalized to every stop error. Microsoft’s WHEA guidance also discusses a recent update, driver, or app as a possible trigger to consider when choosing recovery steps.
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Does a BSOD have to be blue?
No. The screen color and message depend on the Windows release. Microsoft’s current guidance says Windows 11 version 24H2 and later can show a black stop-error screen; its example for Windows 11 version 23H2 and older is blue. Look for the stop-error message or code rather than relying on color alone. A black display with no stop code may be a separate blank-screen issue, not a BSOD. Microsoft distinguishes stop-code errors from blank-screen problems.
What should you do if it happens again?
A single unexpected restart may resolve after the PC restarts. If the same stop code keeps appearing, use the code and the timing of the first occurrence as clues. A problem that began after connecting hardware or installing an update, driver, or app makes that recent change relevant to troubleshooting.
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- Remove recently added hardware. Disconnect a newly connected device if practical, then see whether the error returns.
- Use Safe Mode if Windows is difficult to start normally. Safe Mode can help you investigate with a limited set of drivers and services.
- Check Device Manager. Look for devices marked as having a problem and investigate their drivers.
- Check available disk space. Windows needs free space for normal operation and troubleshooting.
- Install available Windows updates. Then check whether the stop error recurs.
- Consider recovery options if simpler checks do not help. The available choices depend on the Windows version and situation. Microsoft recommends starting with the least disruptive relevant option. See Microsoft’s stop-error troubleshooting steps.
Back up important files before using recovery: some options can cause data loss. The effect depends on the option, so review what it changes before proceeding. Microsoft outlines Windows recovery choices and their effects.
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If the error continues, Windows provides more advanced diagnostic routes, including Event Viewer, Windows Memory Diagnostic, and memory-dump analysis. These can provide additional evidence about a recurring failure, but the appropriate next step depends on the code and circumstances. Microsoft lists these advanced troubleshooting methods.
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