Dell OptiPlex GX60 - Manual (Page 163)

replacement kit was sent.
8. Reconnect the cooling fan power cable to the FAN connector on the system board.
9. Reconnect the power cable to the 12VPOWER connector on the system board.
10. Close the computer cover.
11. Connect your computer and devices to electrical outlets, and turn them on.
After you open and close the cover, the chassis intrusion detector, if enabled, causes the following message to appear on the screen at the next
computer start-up:
ALERT! Cover was previously removed.
12. Reset the chassis intrusion detector by changing the Chassis Intrusion option to Enabled or Enabled-Silent.
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NOTICE: To connect a network cable, first plug the cable into the network wall jack, and then plug it into the computer.
NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting the chassis intrusion
detector.