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When ACPI is toggled Off, pressing the power button turns the system completely
off. When ACPI is not activated (Off), IRQ 9 is available for use by expansion cards.
NOTE: If your operating system does not support ACPI, the computer will not go into
power-saving mode when you press the power button, even if ACPI is toggled to On
in the System Setup program.
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Chassis Intrusion displays the status of the system’s chassis intrusion detector.
If the chassis is opened, the setting changes from Not Detected to Detected and the
following message is displayed during the boot routine at system start-up:
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To clear this field and allow future intrusions to be detected, make sure the chassis
cover is closed, and then enter the System Setup program during the system’s POST,
as described earlier in this chapter. At Chassis Intrusion, use the left- or right-arrow
key to choose Reset. This action changes the setting to its default, Not Detected.
NOTE: If a setup password has been assigned by someone else, contact your net-
work administrator for information on resetting the chassis intrusion detector.
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Thermal Power-off, when enabled, sets a timer to shut down the system approxi-
mately 3 minutes after the system BIOS detects an overtemperature condition for a
processor or hard-disk drive. This feature provides a safeguard in the event that
another shutdown utility, such as the Dell AutoShutdown service, is not installed or
fails to shut the system down after an overtemperature condition.
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Video DAC Snoop lets you correct video problems that may occur when certain video
expansion cards are used. The default setting, Off, improves system compatibility, but
may prevent some video expansion cards from working properly.
If you are using a video expansion card and problems such as incorrect colors or blank
windows occur, set Video DAC Snoop to On.
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Keyboard Errors enables or disables reporting of keyboard errors during the POST,
which is a series of tests that the system performs on the hardware each time you
turn on the system or press the reset button.
This option is useful when applied to self-starting servers or host systems that do not
have a permanently attached keyboard. In these situations, selecting Do Not Report
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