Lenovo 3000 C305 All-In-One - Manual (Page 37)

Chapter 7. Replacing hardware
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8. Slide the memory cover backward until it snaps into position.
9. Screw back the screw on the memory cover.
Removing the computer cover
Attention:
Turn off the computer and wait 3 to 5 minutes to let the computer
cool before removing the computer cover.