What Causes Blue Screen of Death (BSOD) on Windows 11?
A Blue Screen of Death (BSOD) — officially called a Stop Error — means Windows 11 encountered a critical error it cannot recover from. The screen shows a stop code (like CRITICAL_PROCESS_DIED or MEMORY_MANAGEMENT) that identifies the root cause. BSODs in 2026 are most commonly triggered by:
- Faulty RAM or RAM incompatibility with the motherboard
- Outdated or corrupt device drivers (especially GPU and storage drivers)
- Failing hard drive or SSD
- Overheating CPU or GPU
- Incompatible hardware after a Windows 11 feature update
- Corrupt system files
- Malware or rootkits that damage kernel files
Step 1: Read the BSOD Stop Code
Before fixing the BSOD, you need to know the stop code. Windows 11 displays it briefly on the blue screen before rebooting.
1. If your PC keeps BSODing before you can read it: disable automatic restart. Go to Settings → System → About → Advanced system settings → Startup and Recovery → uncheck "Automatically restart"
2. Or read BSOD history: Press Win + X → Event Viewer → Windows Logs → System → look for Critical events with "Bug Check" in the description
3. Use WhoCrashed or WinDbg to analyse the minidump file at C:\Windows\Minidump\ — these tools show exactly which driver or file caused the crash
4. Note the stop code — the most common ones and their fixes are listed in the sections below
Step 2: Run Windows Memory Diagnostic (RAM)
Faulty RAM causes many random BSODs with codes like MEMORY_MANAGEMENT, PAGE_FAULT_IN_NONPAGED_AREA, and IRQL_NOT_LESS_OR_EQUAL.
1. Press Win + R → type mdsched.exe → press Enter
2. Select "Restart now and check for problems"
3. Windows will run the memory test on restart — this takes 10–30 minutes
4. View results after reboot via Event Viewer → Windows Logs → System → look for "MemoryDiagnostics-Results"
5. If errors are found: try reseating the RAM sticks (remove and reinsert). If errors persist, one of your RAM sticks is failing and needs replacement
Step 3: Update or Roll Back Drivers
Driver crashes are the #1 cause of BSODs on Windows 11. GPU drivers, network adapters, and storage controllers are the most common culprits.
1. Open Device Manager: Win + X → Device Manager
2. Look for any yellow warning triangles — these indicate problem drivers
3. For GPU drivers: uninstall the current driver using DDU (Display Driver Uninstaller) in Safe Mode, then download the latest driver directly from NVIDIA, AMD, or Intel's website
4. If a recent driver update caused the BSOD: right-click the device → Properties → Driver tab → "Roll Back Driver"
5. Update storage drivers: expand "Storage controllers" → right-click your controller → Update driver
Step 4: Run SFC and DISM to Repair System Files
Corrupt Windows system files cause BSODs with codes like SYSTEM_SERVICE_EXCEPTION and CRITICAL_PROCESS_DIED.
1. Open Command Prompt as Administrator: search "cmd" → right-click → Run as administrator
2. Run System File Checker: sfc /scannow — this scans and repairs corrupt system files (takes 5–15 minutes)
3. Then run DISM repair:
DISM /Online /Cleanup-Image /RestoreHealth4. Restart after both commands complete
5. Run SFC again after DISM to verify all files are repaired
Step 5: Check Your Hard Drive or SSD for Errors
Storage hardware failures cause BSODs with codes like CRITICAL_PROCESS_DIED, NTFS_FILE_SYSTEM, and UNMOUNTABLE_BOOT_VOLUME.
1. Open Command Prompt as Administrator
2. Run CHKDSK: chkdsk C: /f /r /x — you'll be asked to schedule it for next restart, press Y
3. Restart — CHKDSK runs before Windows loads and repairs bad sectors
4. For SSD health: download CrystalDiskInfo to check the SSD's SMART data. A "Caution" or "Bad" status means the drive is failing
5. If SMART shows reallocated sectors or pending sectors: back up your data immediately and replace the drive
Step 6: Check System Temperature (Overheating)
Overheating causes random BSODs and shutdowns during heavy tasks like gaming, video rendering, or large file transfers. Windows 11 logs thermal events in Event Viewer.
1. Download HWMonitor or Core Temp to check real-time temperatures
2. Normal temperatures: CPU idle should be under 50°C; under load under 85–90°C. GPU under load under 85°C
3. If overheating: clean dust from vents and fans with compressed air; replace thermal paste on the CPU (every 3–5 years); ensure the case has adequate airflow
4. On laptops: use a cooling pad and avoid blocking the vents
Step 7: Fix BSODs in Safe Mode
Safe Mode loads Windows with only essential drivers, helping isolate third-party software or driver conflicts.
1. Boot into Safe Mode: Settings → System → Recovery → Advanced startup → Restart now → Troubleshoot → Advanced options → Startup Settings → Restart → press 4 for Safe Mode
2. If Windows is stable in Safe Mode: the BSOD is caused by a third-party driver or startup program
3. Use MSConfig: press Win + R → msconfig → Services tab → "Hide all Microsoft services" → disable all remaining → restart
4. Re-enable services one by one to identify the problematic service
Step 8: Perform a System Restore
If BSODs started after a recent update or software installation, rolling back to a previous restore point may resolve the issue.
1. Press Win + R → type rstrui.exe → Enter
2. Select a restore point from before the BSODs started
3. Click Next → Finish — the system will restore and restart
4. Note: System Restore does not affect personal files but will remove programs installed after the restore point date
Common Windows 11 BSOD Stop Codes and Their Fixes
- CRITICAL_PROCESS_DIED: Run SFC + DISM; check for malware; update drivers
- MEMORY_MANAGEMENT: Run Windows Memory Diagnostic; check RAM seating
- IRQL_NOT_LESS_OR_EQUAL: Update or roll back drivers; check for RAM issues
- SYSTEM_SERVICE_EXCEPTION: Run SFC /scannow; update GPU and network drivers
- NTFS_FILE_SYSTEM: Run CHKDSK; check SSD health with CrystalDiskInfo
- WHEA_UNCORRECTABLE_ERROR: Hardware failure — check CPU and RAM; run hardware diagnostics
- PAGE_FAULT_IN_NONPAGED_AREA: Usually RAM — run Memory Diagnostic; update drivers
When to Get Professional Help
If your Windows 11 PC continues to BSOD after completing all these steps, the issue is likely hardware-level — failing RAM, SSD, or CPU. CloudHouse Technologies provides remote Windows 11 diagnostics — our engineers can analyse your BSOD minidump files, identify the exact failing component, and guide you through the most cost-effective repair path without an in-person visit.