Lenovo Computer ThinkCentre M900 10NG

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 be replaced

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

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

Ensure the Wi-Fi card size matches the figure provided

Verify the locations of Wi-Fi antenna connectors

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

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 optical drive adapter from the USB connectors on the external optical drive and the computer

Remove the external optical drive box

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

Slide the external optical drive box to remove it from the VESA mount bracket

Remove the external optical drive

Pre-replacement Safety Measures

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.

Replacing the 2.5-inch Storage Drive

Remove the computer cover. See 'Removing the computer cover' on page 77.

Locate the 2.5-inch storage drive. See 'Computer components' on page 5.

Is there a front Wi-Fi antenna installed?

Disconnect the front Wi-Fi antenna cable from the Wi-Fi card if applicable.

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