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  2. Power-on self-test - Wikipedia

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

    With boot times more of a concern now than in the 1980s, the 30- to 60-second memory test adds undesirable delay for a benefit of confidence that is not perceived to be worth that cost by most users. Most clone PC BIOSes allowed the user to skip the POST RAM check by pressing a key, and more modern machines often performed no RAM test at all ...

  3. Safe mode - Wikipedia

    en.wikipedia.org/wiki/Safe_mode

    Safe mode is a diagnostic mode of a computer operating system (OS). It can also refer to a mode of operation by application software . Safe mode is intended to help fix most, if not all, problems within an operating system.

  4. Booting - Wikipedia

    en.wikipedia.org/wiki/Booting

    These choices can include different operating systems (for dual or multi-booting from different partitions or drives), different versions of the same operating system (in case a new version has unexpected problems), different operating system loading options (e.g., booting into a rescue or safe mode), and some standalone programs that can ...

  5. BIOS - Wikipedia

    en.wikipedia.org/wiki/BIOS

    A boot menu such as the textual menu of Windows, which allows users to choose an operating system to boot, to boot into the safe mode, or to use the last known good configuration, is displayed through BIOS and receives keyboard input through BIOS. [4]

  6. UEFI - Wikipedia

    en.wikipedia.org/wiki/UEFI

    When Secure Boot is enabled, it is initially placed in "setup" mode, which allows a public key known as the "platform key" (PK) to be written to the firmware. Once the key is written, Secure Boot enters "User" mode, where only UEFI drivers and OS boot loaders signed with the platform key can be loaded by the firmware.

  7. System Restore - Wikipedia

    en.wikipedia.org/wiki/System_Restore

    System Restore is a feature in Microsoft Windows that allows the user to revert their computer's state (including system files, installed applications, Windows Registry, and system settings) to that of a previous point in time, which can be used to recover from system malfunctions or other problems.

  8. ACPI - Wikipedia

    en.wikipedia.org/wiki/ACPI

    The "It's now safe to power off the system" screen in Windows 10 and 11. Microsoft's Windows 98 was the first operating system to implement ACPI, [ 17 ] [ 18 ] but its implementation was somewhat buggy or incomplete, [ 19 ] [ 20 ] although some of the problems associated with it were caused by the first-generation ACPI hardware. [ 21 ]

  9. Magic SysRq key - Wikipedia

    en.wikipedia.org/wiki/Magic_SysRq_key

    When using Kernel Mode Setting, switch to the kernel's framebuffer console. [5] If the in-kernel debugger kdb is present, enter the debugger. g: i: g: d: Output a terse help document to the console Any key which is not bound to a command should also perform this action h: d: h: h: Send the SIGKILL signal to all processes except init (PID 1) i ...