It is now time to reinsert the expansion card back into the expansion slot on the motherboard.
Before inserting the card, move all wires and cables out of your way and away from the expansion slot on the motherboard. There are small wires inside a computer that can easily be cut if they come between the expansion card and the expansion slot on the motherboard.
Carefully align the expansion card with the slot on the motherboard and with the side of the case. It may take a little maneuvering on your part, but you need to make sure that when you push the card into the expansion slot, it will fit properly in the slot and against the side of the case.
Once you've properly aligned the expansion card, push down firmly on both sides of the card with both hands. You should feel a little resistance as the card goes in the slot but it should not be difficult. If the expansion card does not go in with a firm push, you may not have aligned the card properly with the expansion slot.
Note: Expansion cards only fit into the motherboard one way. If it's hard to tell which way the card goes in, remember that the mounting bracket will always face towards the outside of the case.