Lenovo PC 300GL User Guide (including system setup and option in - Page 69

Do not operate your computer with the cover removed., stops and lift the cover from the chassis.

Page 69 highlights

5. Slide the cover straight toward the rear approximately one inch until it stops and lift the cover from the chassis. Attention Proper cooling is required for the reliable performance of internal components. Do not operate your computer with the cover removed. Chapter 7. Installing Options 55

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5.
Slide the cover straight toward the rear approximately one inch until it
stops and lift the cover from the chassis.
Attention
Proper cooling is required for the reliable performance of internal
components.
Do not operate your computer with the cover removed.
Chapter 7.
Installing Options
55