How to Open a Dell Dimension 8100 Case
The case on the Dell Dimension 8100 desktop computer has to be removed if you want to upgrade or replace internal devices like memory modules, expansion cards, drives and the like, or if you want to clean the dust out of the system. You don't need tools to remove the case, unless you locked it with a padlock, for which you'll need the lock key. You can crack this nut in a matter of minutes and get right to work on the insides.
Shut down the computer. Allow the computer to go all the way off before you move on to the next step.
Disconnect the power cable from the computer.
Remove all the components and cables from the computer, including the keyboard and mouse, devices connected to USB and Ethernet ports, speakers, microphones and anything else that can be taken off.
Turn the computer around so that the back faces toward you and locate the padlock ring on the bottom, right side of the back wall. If a padlock is installed, remove it and slide the outer part of the padlock ring to the left of the inner part.
Turn the computer so that the front faces you and locate the computer cover release button at the bottom, left side of the front cover.
Press and hold the computer cover release button and swing the left side of the computer up until it stops.
Lay the computer on its right side and you're ready to work on the inside of the computer.