Lenovo Computer ThinkCentre M900 10JQ

Remove any media from the drives and turn off all connected devices and the computer.

Disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer.

Disconnect the internal speaker cable from the internal speaker connector on the system board.

Release the two tabs securing the internal speaker and lift the internal speaker out of the holder.

Ensure all media is removed from drives and all connected devices and the computer are turned off.

Disconnect all power cords from electrical outlets and all cables connected to the computer.

Remove the storage drive bracket.

Locate the memory module to be replaced on the system board.

Open the retaining clips and gently remove the memory module from the slot.

Pre-replacement Safety Precautions

Read and understand the 'Read this first: Important safety information' on page iii

Refer to the 'Lithium coin-cell battery notice' in the Safety and Warranty Guide

Remove any media from the drives and turn off all connected devices and the computer

Disconnect all power cords from electrical outlets and disconnect all cables connected to the computer

Accessing the Coin-cell Battery

Remove the storage drive bracket

Read and understand the 'Read this first: Important safety information' on page iii

Remove any media from the drives and turn off all connected devices and the computer

Disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer

Remove the storage drive bracket

Disconnect the Wi-Fi antenna cables from the Wi-Fi card

Remove the screw that secures the Wi-Fi card

Pull the Wi-Fi card out of the M.2 Wi-Fi card slot

Read and understand the 'Read this first: Important safety information' on page iii

Remove any media from the drives

Turn off all connected devices and the computer

Disconnect all power cords from electrical outlets

Disconnect all cables connected to the computer

Disconnect the system fan cable from the system fan connector on the system board