Replacing A Memory Module - Lenovo ThinkCentre M90 Hardware Maintenance Manual

Replacing a memory module

Attention
Do not open your computer or attempt any repair before reading and understanding the "Important safety
information" in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy
of the ThinkCentre Safety and Warranty Guide, go to:
http://www.lenovo.com/support
This section provides instructions on how to install or replace a memory module.
Your computer has four slots for installing or replacing DDR3 DIMMs that provide up to a maximum of 16 GB
system memory. When installing or replacing a memory module, use the following guidelines:
• Use 1 GB, 2 GB, or 4 GB DDR3 DIMMs in any combination up to a maximum of 16 GB.
• Install memory modules in the sequence of DIMM 1, DIMM 3, DIMM 2, and DIMM 4. See "Locating
parts on the system board" on page 70.
To install or replace a memory module, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See "Removing the computer cover" on page 68.
3. Locate the memory slots. See "Locating parts on the system board" on page 70.
4. Remove any parts that might prevent your access to the memory slots. Depending on your computer
model, you might need to remove the PCI Express x16 graphics card for easier access to the memory
slots.
5. Open the retaining clips.
Figure 7. Opening the retaining clips
If you are replacing an old memory module, open the retaining clips and gently pull the memory module
out of the memory slot.
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Chapter 8 Replacing FRUs (Machine Types: 3029, 3054, 3139, 3219, 3246, 3282, 3349, 3421, 3544, 3652, 3769, 3934,
4992, 5206, 5267, 5325, 5384, 5450, 5474, 5498, 5554, 5852, 6232, and 6590.)
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