Compaq Armada 4100 Installation And Operation Manual page 14

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7. Turn the computer and MCD over, bottom side up.
8. Turn the two thumbscrews clockwise to securely attach the
MCD to the computer.
!
Thumbscrew Locations
9. Turn the computer and MCD over, top side up.
10. Reconnect all external devices to the computer and MCD.
11. Turn on the computer.
2-4 Attaching and Detaching Procedures
WARNING: Failure to secure the thumbscrews to the MCD can
result in damage to the computer. Secure the thumbscrews each
time you attach the computer to the MCD.