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XPS 15 9520 Service Manual

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F12 One Time Boot menu

To enter the One Time Boot menu, turn on your computer, and then press F12 immediately.
NOTE:If you are unable to enter the One Time Boot menu, repeat the above action.

The One Time Boot menu displays the devices that you can boot from and also display the options to start diagnostics. The boot menu options are:

  • Removable Drive (if available)
  • STXXXX Drive (if available)
    NOTE:XXX denotes the SATA drive number.
  • Optical Drive (if available)
  • SATA Hard Drive (if available)
  • Diagnostics

The One Time Boot menu screen also displays the option to access BIOS Setup.

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