Lenovo Computer ThinkCentre M900 10ND

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 connected to the computer

Remove the storage drive bracket

Locate the memory module to replace

Open the retaining clips and gently pull the memory module out of the memory slot

Insert the notched end of the new memory module into the slot and press firmly until it snaps into place

Ensure the memory module is secured in the slot and does not move easily

Prepare the Computer and Devices

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

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

Disconnect External Optical Drive Adapter

Remove External Optical Drive Box

Remove the screw securing the external optical drive box on the VESA mount bracket.

Slide and remove the external optical drive box from the VESA mount bracket.

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.

Turn off all connected devices and the computer.

Disconnect all power cords from electrical outlets.

Disconnect all cables connected to the computer.

Pre-replacement Safety Measures

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

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

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

Disconnect the external battery box cable from the USB connector on the computer.

Remove the screw securing the external battery box on the VESA mount bracket.

Slide the external battery box to remove it from the VESA mount bracket.

Slide the release button on the external battery box and use a screwdriver to slide the battery forward.

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