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  2. Option ROM - Wikipedia

    en.wikipedia.org/wiki/Option_ROM

    The boot loader on the option ROM would attempt to boot from a disk, network, or other boot program source attached to or installed on the adapter card; if that boot attempt failed, it would pass control to the previous boot loader (to which INT 19h pointed before the option ROM hooked it), allowing the system to boot from another device as a ...

  3. BIOS - Wikipedia

    en.wikipedia.org/wiki/BIOS

    On the original IBM PC and XT, if no bootable disk was found, the BIOS would try to start ROM BASIC with the interrupt call to interrupt 18h. Since few programs used BASIC in ROM, clone PC makers left it out; then a computer that failed to boot from a disk would display "No ROM BASIC" and halt (in response to interrupt 18h).

  4. Windows Preinstallation Environment - Wikipedia

    en.wikipedia.org/wiki/Windows_Preinstallation...

    Windows Recovery Environment (WinRE) is a set of tools based on Windows PE to help diagnose and recover from serious errors which may be preventing Windows from booting successfully. Windows RE is installed alongside Windows Vista and later, and may be booted from hard disks, optical media (such as an operating system installation disc) and PXE ...

  5. Boot disk - Wikipedia

    en.wikipedia.org/wiki/Boot_disk

    A modern PC is configured to attempt to boot from various devices in a certain order. If a computer is not booting from the device desired, such as the floppy drive, the user may have to enter the BIOS Setup function by pressing a special key when the computer is first turned on (such as Delete, F1, F2, F10 or F12), and then changing the boot order. [6]

  6. UEFI - Wikipedia

    en.wikipedia.org/wiki/UEFI

    With UEFI, it is possible to store product keys for operating systems such as Windows, on the UEFI firmware of the device. [21] [22] [23] UEFI is required for Secure Boot on devices shipping with Windows 8 [24] [25] and above. It is also possible for operating systems to access UEFI configuration data. [26]

  7. Power-on self-test - Wikipedia

    en.wikipedia.org/wiki/Power-on_self-test

    No RAM installed/detected Three successive tones followed by a repeating five-second pause: Incompatible RAM types; No good banks One long tone while the power button is held down: EFI ROM update in progress (For Macs made until 2012) Three long tones, three short tones, three long tones: EFI ROM corruption detected, ROM recovery in process

  8. Booting - Wikipedia

    en.wikipedia.org/wiki/Booting

    When debugging a concurrent and distributed system of systems, a bootloop (also written boot loop or boot-loop) is a diagnostic condition of an erroneous state that occurs on computing devices; when those devices repeatedly fail to complete the booting process and restart before a boot sequence is finished, a restart might prevent a user from ...

  9. Live USB - Wikipedia

    en.wikipedia.org/wiki/Live_USB

    To set up a live USB system for commodity PC hardware, the following steps must be taken: A USB flash drive needs to be connected to the system, and be detected by it; One or more partitions may need to be created on the USB flash drive; The "bootable" flag must be set on the primary partition on the USB flash drive

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