Windows stop codes (blue screen)
Your PC showed a blue screen and restarted? Find the stop code below to see what it means, what usually causes it and how to fix it safely.
Before you start: note the stop code shown on the blue screen. If Windows will not start normally, it usually opens Automatic Repair after two failed starts; from there choose Advanced options to reach Safe Mode or System Restore.
Most common blue screen codes
0xEF CRITICAL_PROCESS_DIEDA process that Windows needs to run stopped unexpectedly.0xA IRQL_NOT_LESS_OR_EQUALA driver or system process tried to access memory it was not allowed to use, usually because of a faulty driver.0x1A MEMORY_MANAGEMENTA serious memory management error occurred, often caused by faulty RAM or a driver.0x50 PAGE_FAULT_IN_NONPAGED_AREAWindows tried to use memory that does not exist or is not available, often due to a driver, security software or faulty RAM.0x3B SYSTEM_SERVICE_EXCEPTIONAn error occurred while a system service was running, often caused by a driver (frequently graphics) or security software.0x133 DPC_WATCHDOG_VIOLATIONA driver or device took too long to finish its work, often a storage or SSD driver or firmware.0x124 WHEA_UNCORRECTABLE_ERRORA fatal hardware error occurred (Windows Hardware Error Architecture).0x7B INACCESSIBLE_BOOT_DEVICEWindows lost access to the system drive during startup.
Windows stop codes (blue screen)
0xA IRQL_NOT_LESS_OR_EQUALA driver or system process tried to access memory it was not allowed to use, usually because of a faulty driver.0x19 BAD_POOL_HEADERThe memory pool used by Windows has become corrupted, usually by a faulty driver.0x1A MEMORY_MANAGEMENTA serious memory management error occurred, often caused by faulty RAM or a driver.0x1E KMODE_EXCEPTION_NOT_HANDLEDA program running in the Windows kernel caused an error that it did not handle.0x24 NTFS_FILE_SYSTEMA problem occurred in the NTFS file system driver, usually because of disk or file system corruption.0x2E DATA_BUS_ERRORA memory parity error was detected, which usually means faulty RAM or other hardware.0x3B SYSTEM_SERVICE_EXCEPTIONAn error occurred while a system service was running, often caused by a driver (frequently graphics) or security software.0x3F NO_MORE_SYSTEM_PTESWindows ran out of system page table entries, usually because a driver is not releasing memory.0x4E PFN_LIST_CORRUPTWindows' list of memory pages is corrupted, usually by a driver or faulty RAM.0x50 PAGE_FAULT_IN_NONPAGED_AREAWindows tried to use memory that does not exist or is not available, often due to a driver, security software or faulty RAM.0x74 BAD_SYSTEM_CONFIG_INFOThere is an error in the Windows registry configuration.0x77 KERNEL_STACK_INPAGE_ERRORWindows could not read kernel data from the page file into memory, usually because of a disk problem or faulty RAM.0x7A KERNEL_DATA_INPAGE_ERRORWindows could not read a page of kernel data into memory, usually because of a disk, cable or RAM problem.0x7B INACCESSIBLE_BOOT_DEVICEWindows lost access to the system drive during startup.0x7E SYSTEM_THREAD_EXCEPTION_NOT_HANDLEDA system thread caused an error that was not handled, usually because of a driver.0x7F UNEXPECTED_KERNEL_MODE_TRAPThe processor raised a trap that the Windows kernel could not handle, often a hardware or overclocking problem.0x9C MACHINE_CHECK_EXCEPTIONThe processor reported a fatal hardware error (machine check).0x9F DRIVER_POWER_STATE_FAILUREA driver failed while the PC was entering or waking from sleep or changing power state.0xBE ATTEMPTED_WRITE_TO_READONLY_MEMORYA driver tried to write to read-only memory.0xC2 BAD_POOL_CALLERA driver or program made an invalid memory request.0xC4 DRIVER_VERIFIER_DETECTED_VIOLATIONDriver Verifier caught a driver doing something illegal.0xC5 DRIVER_CORRUPTED_EXPOOLA driver corrupted the system memory pool.0xD1 DRIVER_IRQL_NOT_LESS_OR_EQUALA driver tried to access memory at a time it was not allowed to, almost always a faulty driver.0xEA THREAD_STUCK_IN_DEVICE_DRIVERA device driver got stuck waiting for its hardware, most often the graphics card.0xED UNMOUNTABLE_BOOT_VOLUMEWindows could not mount the startup drive.0xEF CRITICAL_PROCESS_DIEDA process that Windows needs to run stopped unexpectedly.0xF4 CRITICAL_OBJECT_TERMINATIONA process or thread essential to Windows ended unexpectedly.0xFE BUGCODE_USB_DRIVERAn error occurred in a USB driver.0x101 CLOCK_WATCHDOG_TIMEOUTA processor core stopped responding (an expected clock interrupt was not received in time).0x109 CRITICAL_STRUCTURE_CORRUPTIONWindows detected that critical kernel code or data was corrupted.0x113 VIDEO_DXGKRNL_FATAL_ERRORThe DirectX graphics kernel detected a fatal error.0x116 VIDEO_TDR_FAILUREThe graphics driver stopped responding and Windows could not recover it.0x119 VIDEO_SCHEDULER_INTERNAL_ERRORThe graphics scheduler detected a fatal error.0x124 WHEA_UNCORRECTABLE_ERRORA fatal hardware error occurred (Windows Hardware Error Architecture).0x133 DPC_WATCHDOG_VIOLATIONA driver or device took too long to finish its work, often a storage or SSD driver or firmware.0x139 KERNEL_SECURITY_CHECK_FAILUREWindows detected corruption of a critical data structure.0x13A KERNEL_MODE_HEAP_CORRUPTIONWindows detected corruption in kernel-mode memory (the heap).0x154 UNEXPECTED_STORE_EXCEPTIONThe memory store component hit an unexpected error, often linked to the disk or security software.