This guide will help you to switch out the old graphics card with a new one. This is my first instructable, so feel free to comment.
Step 1: Opening the computer
The first step to switching the graphics card is to open up the computer case. Unplug all cables and ensure that the computer is switched off. Then unscrew the screws that hold the side panels in place. Some case models do not feature a different method of opening the case; consult the handbook sent with the computer case to find the correct way to open up the case. Once the side panel is removed, continue with the next step: Removing the old graphics card.