When the BIOS / UEFI screen appears, let go of the volume button. Start by lifting each corner of the key, listening and feeling for a snap as it unhooks.
Use the up and down arrow keys to select Diagnostics on the menu and press the Enter key.
You should see a blue "Enter your login details once, and True Key does the rest. The BIOS allows you to control hardware features on your Dell computer such as enabling or disabling hardware components, monitoring system temperatures and speeds, or setting boot sequence to boot the computer from a CD. The key sequence invokes the Boot Device Menu. The problem is, is that the Multimedia/OEM keys are the default, and you have to press the Fn key to get the F1-F12 key to work. Every time the unit is shut down, and then powered back on, it prompts for the Bitlocker recovery key before booting to Windows. On start-up, it now hangs on the Dell logo or when trying boot options to start from USB or recovery DVD go to blank black screen.
You may need to press the key repeatedly until the utility appears. The boot menu key for Dell computers is F12. It is a modifier key that is used on most laptop models to activate secondary or special functions of other keys. A normal MBR does not contain any provision for recognizing the Ctrl+F11 key combination, so would simply ignore the keys and boot normally.
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