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2. How to disable Secure Boot on your PC when you need to ... - AOL

   www.aol.com/news/disable-secure-boot-pc-install...

   You can disable Secure Boot by restarting your PC and opening the Unified Extensible Firmware Interface (UEFI).

3. 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 ...

4. 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.

5. Why is my computer so slow? - AOL

   www.aol.com/products/blog/why-is-my-computer-so-slow

   Slow Startup: If your computer takes an unusually long time to boot up and become usable after turning it on, it could be a sign of underlying issues such as too many startup programs or a ...

6. Pre-boot authentication - Wikipedia

   en.wikipedia.org/wiki/Pre-boot_authentication

   A PBA environment serves as an extension of the BIOS, UEFI or boot firmware and guarantees a secure, tamper-proof environment external to the operating system as a trusted authentication layer. [2] The PBA prevents any operating system from loading until the user has confirmed he/she has the correct password to unlock the computer. [2]

7. Safe mode - Wikipedia

   en.wikipedia.org/wiki/Safe_mode

   For example, on Microsoft Windows, the user can also choose to boot to the Recovery Console, a small text-based troubleshooting mode kept separate from the main operating system (which can also be accessed by booting the install CD) or to various "safe mode" options that run the dysfunctional OS but with features, such as video drivers, audio ...