This article provides troubleshooting techniques for problems that occur during the first three phases. Before starting troubleshooting, you have to understand the outline of the boot process and display status to ensure that the issue is properly identified at the beginning of the engagement.Įach phase has a different approach to troubleshooting. Here is a summary of the boot sequence, what will be seen on the display, and typical boot problems at that point in the sequence. The kernel passes control to the session manager process (Smss.exe) which initializes the system session, and loads and starts the devices and drivers that are not marked BOOT_START. The kernel loads into memory the system registry hive and additional drivers that are marked as BOOT_START.

Windows Boot Manager finds and starts the Windows loader (Winload.exe) on the Windows boot partition.Įssential drivers required to start the Windows kernel are loaded and the kernel starts to run. Firmware reads the master boot record (MBR), and then starts Windows Boot This pre-boot process ends when a valid system disk is detected. The PC’s firmware initiates a Power-On Self Test (POST) and loads firmware settings. To troubleshoot boot problems, first determine in which of the following phases the computer gets stuck: Phase There are several reasons why a Windows-based computer may have problems during startup. If you're looking for more general information about recovery options, see Recovery options in Windows 10. This article is intended for use by support agents and IT professionals.

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