Dell XPS 14 9440 Owner's Manual page 83

Figure 48. Chassis intrusion alert
When enabled, the Block Boot Until Cleared field enables you to choose whether to prevent normal boot of the computer until
the intrusion alert is cleared. If Block Boot Until Cleared is set to OFF, select Continue to boot or BIOS-Setup to clear the
alert.
NOTE: If Continue is selected, the alert message appears each time when the computer is turned on until the alert is
cleared.
Figure 49. Warning message indicating that the Block Boot Until Cleared field is set to OFF
To clear the alert, select ON in the Clear Intrusion Warning field in the Security sub-menu of the BIOS setup menu.
BIOS Setup 83