Most computers come in either tower-sized models or desktop-sized models. Tower cases usually have screws that secure removable panels on either side of the case but will sometimes feature release buttons instead of screws. Desktop cases usually feature easy-release buttons that allow you to open the case but some will feature screws similar to tower cases. For screwless cases, look for buttons or levers on the sides or rear of the computer that are used to release the case. If you’re still having difficulties, you can reference your computer or case manual to determine the specific procedure. For example, if you’re reseating a network interface card, make sure the network cable is removed from the card before proceeding. If you’re reseating a sound card, make sure the speaker connection is unplugged. If you try to remove an expansion card without disconnecting everything attached to it, you’ll quickly realize that you forgot this step! Remove the retaining screw and set it aside. You will need this screw again when you reinsert the expansion card. With both hands, firmly grip the top of the expansion card, being careful not to touch any of the sensitive electronic parts on the card itself. Also, make sure that all wires and cables are clear of where you are working. You don’t want to damage something while trying to troubleshoot a problem you’re already having. Pull up a little, one side of the card at a time, slowly working the card out of the slot. Most expansion cards will fit snugly in the motherboard slot, so don’t attempt to yank the card out in one brute pull. You’ll likely damage the card and possibly the motherboard if you’re not careful. Also, inspect the metal contacts on the bottom of the expansion card. The contacts should be clean and shiny. If not, you may need to clean the contacts. First, move all wires and cables out of your way and away from the motherboard’s expansion slot. There are small wires inside a computer that can easily be cut if they come between the card and the slot. 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. Take care not to drop the screw into the case, onto the motherboard, or other parts inside the computer. Besides causing damage to sensitive parts on impact, leaving a screw inside a computer can cause electrical shorting, which can lead to all kinds of serious problems. As described in Step 1, most computers come in either tower-sized models or desktop-sized models, which means there might be different procedures for opening and closing the case.
