Dell Dimension 4100 - Manual (Page 47)

Adding Parts 47
Make sure that the card is fully seated and that its bracket is within the
card slot.
6 Secure the bracket on the end of the card with the screw you removed
in step 2.
7 Connect any cables required for the card as described in the card
documentation.
8 Replace the computer cover (see page 71).
NOTICE: To connect a network cable, first plug the cable in to the network
jack and then plug it in to the computer.
9 Plug your computer and devices into their electrical outlets, and turn
them on.
10 Install any drivers required for the card as described in the card
documentation.
fully seated not fully seated
bracket caught
outside of slot
bracket within slot