While you may not often tinker with the insides of your computer, it is a good idea to know a little about what it is like in there. The diagram at the left shows a basic arrangement.
(This tower case is taller than normal and has wide feet for balance.)
 
The first task is to remove the case so we can see what's inside.
 
Then you can click on the inside parts for a description, which will show up right here.