Dell E-Port Plus - Manual (Page 12)

12 Using the Dell™ E-Port Plus
5 Push the lock/unlock switch toward the back of the E-Port to unlock it.
The E-Port must be unlocked to dock a laptop.
NOTE: You can dock your laptop regardless of whether it is turned on or off.
6 Center the laptop with the E-Port Plus, then push down on the laptop
until it clicks into place in the docking connector.
NOTICE: Do not lift the laptop or the E-Port Plus when the laptop is docked. Doing
so can damage the connectors on the laptop and on the E-Port Plus.
7 If the laptop was not already turned on, turn it on by pressing the power
button on either the laptop or the E-Port Plus.
8 If the laptop does not turn on or awaken successfully, undock and reseat
the laptop.