Lenovo IdeaCentre B300 Hardware Maintenance Manual page 35

To replace the memory module:
1. Remove any media (diskettes, CDs, or memory cards) from the drives,
shut down the operating system, turn off all attached devices, and the
computer.
2. Unplug all power cords from electrical outlets.
3. Disconnect all cables attached to the computer. This includes power
cords, input/output (I/O) cables, and any other cables that are
connected to the computer. Refer to "Locating connectors on the rear
of the computer".
4. Remove the rubber cap that protects the screw.
5. Remove the screw that secures the memory cover to the computer
cover.
6. Lift up the memory cover.
Chapter 8. Replacing hardware
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