IBM INTELLISTATION E PRO 6204 User Manual page 75

4. Pull the cover release latch away from the computer, and push the cover toward
the rear of the computer.
To replace the side cover, see "Replacing the cover" on page 73.
Attention: For proper cooling and airflow, replace the cover before turning on the
computer. Operating the computer with the cover removed might damage computer
components.
Removing the support bracket
When working with some options, such as hard disk drives, adapters, and memory
modules, you must first remove the support bracket to access the existing option.
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Chapter 5. Installing options