5From the outside of the chassis, press the slot latch (E) to lock the card in place. (See the Warning that follows.) The following figure shows a locked slot latch at (F).
E 
F 
WARNING: Do not force the slot latch to close. Check inside the chassis that the card (G) fits against and around the alignment pin (H). Do not close the latch unless the card is properly seated.
H
G
6Connect cables to the card as needed.
IMPORTANT: Some graphics cards require two power cable plugs. These two power cables must connect to power supply connectors that are in the same row of the power supply. Do NOT connect the two power cables from one graphics card to connectors on different rows of the power supply.
Upgrading and Servicing Guide 43