Dell OptiPlex 745c (Early 2007) User Manual
Page 103
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If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop. Then shut down your
computer and try again.
3.
Select the Chassis Intrusion option and then press the left- or right-arrow key to select Reset. Change the setting to On, On-Silent, or Disabled.
4.
Press <Alt><b> to restart the computer and implement your changes.
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NOTE:
The default setting is On-Silent.
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