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XPS 15 Service Manual

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Fixing a no-boot issue caused by USB-boot support

Sometimes the computer does not boot to the operating system when USB devices are connected to the computer during startup. This behavior occurs because the computer is looking for bootable files in connected USB devices.

Either disconnect USB devices before booting or follow these steps to fix the no-boot issue.

  1. Turn on or restart your computer.
  2. Press F2 when the Dell logo is displayed on the screen to enter the BIOS setup program.
    NOTE The F2 prompt indicates that the keyboard is initialized. This prompt can appear very quickly, so you must watch for it, and then press F2. If you press F2 before the F2 prompt, this keystroke is lost. If you wait too long and the operating system logo appears, continue to wait until you see the desktop. Then, turn off your computer and try again.
    The BIOS setup program is displayed.
  3. On the left pane, select Settings > System Configuration > USB Configuration.
    The USB configuration is displayed on the right pane.
  4. Clear the Enable Boot Support check box to disable it.
  5. Save the settings and exit.

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