Key takeaways
- Photograph the screen and note the stop code, such as MEMORY_MANAGEMENT or CRITICAL_PROCESS_DIED.
- Ask what changed: a Windows update, a driver, a new program or new hardware. Undo that first.
- Test the memory and the drive, and run the system file repair commands.
- Repeated crashes mean back up your files now, because failing memory or a failing drive can get worse.
Quick answer: what to do after a blue screen
- Do not panic and do not keep rebooting blindly. If the laptop restarts into Windows normally, take a moment to breathe and then continue below.
- Note the stop code if you can: a line in capital letters such as CRITICAL_PROCESS_DIED or MEMORY_MANAGEMENT. Photograph it with your phone if it stays long enough.
- Remember what changed in the last few days: a Windows update, a new program, a driver, a printer or other new device, or a drop or knock to the laptop.
- Back up important files while Windows still starts.
- Work through the fixes below, in order. Test after each, so you know which one worked.
If you only see one blue screen and nothing else odd happens afterwards, it may have been a temporary glitch. Keep an eye on it for a few days.
What causes a blue screen?
Windows crashes with a blue screen when something at the core of the system, usually a driver or hardware, does something illegal or stops responding. The usual causes, roughly from most to least common:
- Drivers: a new, corrupted or incompatible driver for graphics, Wi-Fi, a touchpad or a USB device.
- Windows updates that did not install cleanly, or an update that clashes with a driver.
- Memory (RAM) faults or a memory module that has come loose.
- A failing drive: bad sectors on a hard drive, or an SSD with errors.
- Overheating, because the processor or graphics chip protects itself by crashing.
- Corrupted system files, sometimes after a sudden power cut or forced shutdown.
- Malware or badly behaved software, including some antivirus programs and cracked software.
- Failing power parts: a worn battery or faulty charger can cause crashes, as can a failing board.
How to read the stop code
The stop code is your best clue. The most common ones and where to look first:
- MEMORY_MANAGEMENT: suspect RAM or the drive. Run the memory test below.
- CRITICAL_PROCESS_DIED: a core Windows process ended. Damaged system files, a bad driver or drive problems. Run the file repair commands and check the drive.
- IRQL_NOT_LESS_OR_EQUAL, SYSTEM_SERVICE_EXCEPTION, DRIVER_IRQL_NOT_LESS_OR_EQUAL: usually a faulty driver. Update or roll back recent drivers.
- PAGE_FAULT_IN_NONPAGED_AREA: faulty memory, a bad driver, or sometimes antivirus software.
- KERNEL_DATA_INPAGE_ERROR, UNMOUNTABLE_BOOT_VOLUME, INACCESSIBLE_BOOT_DEVICE: trouble reading from the drive. Back up and test the drive urgently, since it may be failing.
- DPC_WATCHDOG_VIOLATION: often an outdated SSD firmware or storage driver, or a problem device.
- SYSTEM_THREAD_EXCEPTION_NOT_HANDLED: usually names a file ending in .sys, for example for the graphics driver. The file name tells you which driver to update.
- WHEA_UNCORRECTABLE_ERROR: a hardware error reported by the processor or board. Overheating, failing hardware or unstable settings.
If the file name appears, such as a graphics driver, search for that file name together with the stop code. Many fixes are specific to the driver.
If you missed the code, open the Start menu, type reliability history and open Reliability Monitor. A red cross on a day shows a Windows failure, and clicking it shows the details.
If the laptop will not start properly: get into Safe Mode
If it blue screens before you reach the desktop, you need Windows Recovery.
- Switch the laptop on and, as soon as the manufacturer logo or spinning dots appear, hold the power button to force it off. Repeat this two or three times. On the next start, Windows should show Preparing Automatic Repair and then the recovery menu.
- Choose See advanced repair options (or Advanced options), then Troubleshoot, then Advanced options.
- Choose Startup Settings, then Restart. When the list appears, press 4 for Safe Mode, or 5 for Safe Mode with Networking.
Safe Mode loads only the basic drivers. If the laptop is stable in Safe Mode, a driver or program is the likely cause. From there you can uninstall programs, roll back drivers and run the repairs below. If the laptop still crashes in Safe Mode, suspect hardware (memory, drive, heat).
The same Advanced options menu also includes System Restore, Uninstall Updates and Startup Repair, which are covered below.
Undo recent changes
Uninstall a recent Windows update
Open Settings, Windows Update, Update history, then Uninstall updates at the bottom (Windows 10: Settings, Update & Security, View update history, Uninstall updates). Select the latest one that began around the time the crashes started, and uninstall it.
Roll back or update a driver
- Right-click Start and open Device Manager.
- Expand the suspect category, commonly Display adapters (graphics), Network adapters, or Sound.
- Double-click the device, open the Driver tab and choose Roll Back Driver if it is available. If not, try Update Driver or download the correct one from the laptop maker's support page.
Remove new programs and devices
Unplug new devices such as printers, USB adapters and external drives, and uninstall newly installed programs (Settings, Apps). Be especially suspicious of cracked software, "driver booster" tools and "PC cleaner" programs.
Use System Restore
Type Create a restore point in the Start menu, choose System Restore and pick a restore point from before the crashes began. This puts system files and drivers back without touching your personal files. It only works if restore points were turned on earlier.
Repair damaged system files
Open the Start menu, type cmd, right-click Command Prompt and choose Run as administrator. Then run these in order, waiting for each to finish:
- sfc /scannow. This scans Windows system files and repairs damaged ones. It can take 10 to 20 minutes. A message saying it found and repaired corrupt files is a good result. A message saying it found corrupt files it could not repair means you should run the next step.
- DISM /Online /Cleanup-Image /RestoreHealth. This repairs the Windows component store using Windows Update. It needs an internet connection and can sit at a percentage for a long time. Be patient. Then run sfc /scannow again.
Restart afterwards and see whether the crashes continue. Keep the laptop plugged in during these repairs so a battery that runs out does not interrupt them.
Test the memory and the drive
Memory test
- Save your work. Press Windows key + R, type mdsched.exe and press Enter.
- Choose Restart now and check for problems.
- The laptop restarts into a blue test screen and runs for several minutes. When it returns to Windows, the result appears in a notification. If you miss it, open Event Viewer, then Windows Logs, System, and look for MemoryDiagnostics-Results.
Any error means a faulty memory module. Switching the laptop off and reseating the memory is a job for a technician on most laptops. Some laptops have memory soldered to the board.
Drive check
Open File Explorer, right-click your C: drive, choose Properties, Tools, then Check. For a deeper check, in an administrator Command Prompt type chkdsk C: /f, press Y to schedule it, and restart. Be careful: if the drive is physically failing, running a long repair can push it further. If you hear clicking, the laptop freezes when opening files, or you see signs of drive failure, copy your important files first, or stop and bring the laptop in.
Check heat, dust and loose connections
If crashes happen when gaming, video editing, charging, or after the laptop has been on for an hour, heat is a prime suspect. Check whether the fan is loud and the base is very hot. A laptop used on a bed or sofa chokes its own vents. Clean the vents, use it on a hard surface and see whether the crashes stop.
Crashes after a knock or drop, or crashes that seem random and unrelated to what you were doing, can mean a loose memory module, a bad connection or a failing board. A technician can reseat parts and test each one.
Finally, try the laptop on the charger only and on battery only. A worn battery or a poor-quality charger can cause crashes.
When to bring it in, and the last resorts
Bring the laptop to a technician if:
- It blue screens repeatedly, even after the fixes above.
- You get disk-related stop codes or hear clicking noises.
- The memory test reports errors.
- Windows will not start, or loops through repair.
- Crashes began after a knock, a fall or a spill.
Back up first if Windows still starts. If it does not, tell the technician that your files matter most.
The last resorts in Windows are Reset this PC (Settings, System, Recovery) with the option to keep your files, and a clean reinstall. These fix software causes only. If the cause is hardware, the blue screens will return, so test the memory and drive before you reinstall.
Frequently asked questions
Is the blue screen of death dangerous?
The blue screen itself is Windows protecting your system, not damage. But repeated blue screens can signal failing hardware, such as memory or a drive, and forced shutdowns can corrupt files. Back up your important files as soon as you can and find the cause rather than ignoring it.
Can a blue screen be fixed without reinstalling Windows?
Usually yes. Rolling back or updating a driver, uninstalling a bad update, running sfc and DISM repairs, using System Restore, or replacing faulty memory or a drive fixes most cases. Reinstalling Windows only helps if the cause is software, so test the hardware first.
Why does my laptop blue screen when I play games or edit video?
Heavy use pushes the processor and graphics chip hard. Overheating, an outdated or faulty graphics driver, unstable power or failing memory often show up under this load. Check temperatures and clean the vents, update the graphics driver from the manufacturer and run a memory test.
How do I find out what caused a blue screen?
Note the stop code on the screen, then open Reliability Monitor from the Start menu to see when the crash occurred and what changed around then. Windows also saves crash files that technicians can analyse. Combine this with what you installed or updated just before it began.
What does CRITICAL_PROCESS_DIED mean?
A process Windows depends on stopped unexpectedly. Typical causes are corrupted system files, a faulty driver or a failing drive. Run sfc /scannow and DISM from an administrator Command Prompt, check recent drivers and updates, and test the drive. If it repeats, back up your files and get it checked.
Can a virus cause a blue screen?
Yes, although it is less common than drivers or hardware. Malware and badly written software can damage system files or drivers. Run a full Windows Security scan, including the offline scan, and remove programs you do not recognise. Avoid cracked software, which is a frequent source of crashes and malware.
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This guide is general advice. Every device and business is different, so if you are unsure, ask a technician before you act.
