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# Steps to Boot the Computer and Start Windows (4 of 5) ## BIOS/UEFI checks essential hardware (POST) * **No**: BIOS * Checks BIOS/RAM to find OS * Consults MBR * Searches for active partition * Loads booting * Reads BCD store * **Yes**: Is video active? * **No**: Sends erro...
# Steps to Boot the Computer and Start Windows (4 of 5) ## BIOS/UEFI checks essential hardware (POST) * **No**: BIOS * Checks BIOS/RAM to find OS * Consults MBR * Searches for active partition * Loads booting * Reads BCD store * **Yes**: Is video active? * **No**: Sends error message as beeps or speech * **Yes**: Displays error message on-screen ## UEFI * **Loads UEFI Boot Manager** * **Loads EFI device drivers and enforces Secure Boot** * **Follows boot file path** * **Loads bootmfw.efi** * **Reads BCD store** ## Windows Boot Loader * **Normal startup**: Windows Boot Loader * 1. Loads OS kernel (ntoskrnl.exe) * 2. Loads HAL * 3. Loads System registry hive * 4. Reads registry and, for BIOS systems, loads device drivers * 5. Starts memory paging process * 6. Turns over startup to OS kernel (ntoskrnl.exe) * **Dual-boot system or Windows 7 user presses Spacebar**: Windows Boot Manager screen * **User presses F8**: Advanced Boot Options screen * **Windows previously stopped abruptly**: Error Recovery screen # Figure 6-2 Steps to booting the computer and loading Windows
