Dell OptiPlex GX300 User Manual page 64

8. Replace the computer cover, and reconnect your computer and peripherals to their power sources and turn them on.
NOTE: After you remove and replace the cover, the chassis intrusion detector will cause the following message to be
displayed at the next system start-up:
ALERT! Cover was previously removed.
9. Enter System Setup, and confirm that the top line in the System Data area correctly identifies the installed processor(s).
See "Using System Setup."
10. While in System Setup, reset the chassis intrusion detector by changing Chassis Intrusion to Enabled or Enabled-Silent.
See "Chassis Intrusion" for instructions.
NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting
the chassis intrusion detector.
11. Run the Dell Diagnostics
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to verify that the new microprocessor is operating correctly.