Dell OptiPlex GX1 Installation Manual page 48

Press the left- or right-arrow key to toggle the CPU Speed option between the resident microprocessor's rated speed (the default) and a lower
compatibility speed, which lets you accommodate speed-sensitive application programs. A change to this option takes effect immediately
(rebooting the system is not required).
You can also toggle between the rated processor speed and the compatibility speed while the system is running in real mode by pressing
<Ctrl><Alt><\>. (For keyboards that do not use American English, press <Ctrl><Alt><#>.)
Num Lock
Num Lock determines whether your system boots with the Num Lock mode activated on 101- or 102-key keyboards (it does not apply to 84-key
keyboards).
When Num Lock mode is activated, the rightmost bank of keys on your keyboard provides the mathematical and numeric functions shown at the
tops of the keys. When Num Lock mode is turned off, these keys provide cursor-control functions according to the label on the bottom of each key.
Chassis Intrusion
Chassis Intrusion displays the status of the system chassis intrusion monitor. The settings for this option are Enabled, Enabled-Silent, or Disabled.
The default is Enabled.
If the computer cover is removed while the intrusion monitor is set to Enabled, the setting changes to Detected, and the following message
appears during the boot sequence at the next system start-up:
Alert! Cover was previously removed.
If the computer cover is removed while the intrusion monitor is set to Enabled-Silent, the setting changes to Detected, but the alert message is not
displayed during the boot sequence at the next system start-up.
If the intrusion monitor is set to Disabled, no intrusion monitoring occurs and no messages are displayed.
To reset the Detected setting, enter the System Setup program during the system's power-on self-test (POST). Highlight the Chassis Intrusion
option and press the left- or right-arrow key to choose Enabled, Enabled-Silent, or Disabled.
NOTE: When the setup password is enabled, you must enter the setup password before you can reset the Chassis Intrusion option.
DAC Snoop
DAC Snoop lets you correct video problems that may occur when certain video add-in cards are used. The default is Off. If you are using a video
add-in card and problems such as incorrect colors or blank windows occur, set DAC Snoop to On.
ACPI
This option controls the operation of the system's Advanced Configuration and Power Interface (ACPI) feature.
When ACPI is set to On, momentarily pressing the power button places the system in a power-saving mode. To turn the system off completely,
press the power button for more than 4 seconds. When ACPI is set to On, interrupt request (IRQ) line 9 is not available for use by an expansion
card.
When ACPI is set to Off, momentarily pressing the power button turns off the system completely. With this setting, IRQ9 is available for use by an
expansion card.
Keyboard Errors
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 have no permanently attached keyboard. In these situations,
selecting Do Not Report suppresses all error messages relating to the keyboard or to the keyboard controller during POST. This option does not
affect the operation of the keyboard itself if a keyboard is attached to the computer.
System Password
System Password displays the current status of your system's password security feature and allows you to assign and verify a new password. No
one can assign a new password unless the current status is Not Enabled, which is displayed in bright characters.
The settings for the System Password option are the following:
Not Enabled (the default option)
l
Enabled
l
Disabled by Jumper
l
NOTE: Read "Using the System Password
system password. See "Disabling a Forgotten
Feature" for instructions on assigning a system password and using or changing an existing
Password" for instructions on disabling a forgotten system password.