This article explains how to open a desktop computer case, which contains all of the components of a computer. Every computer is a little different, but these instructions will point you in the right direction no matter what type of case you have.
How to open a computer case
Before opening the case, turn off the computer.
Shut down your operating system as you normally would. Find the power switch on the back of your computer and turn it off.
Some computers do not have a power switch on the back. If you do not find one, go to the next step.