Lenovo ThinkCentre M90s Gen 2 Hardware Maintenance Manual page 81

For access, remove these parts in order:
• "Computer cover" on page 61
• "Front bezel" on page 62
• "Drive bay assembly" on page 64
Replacement procedure
Note: During the installation, ensure that you align the memory module to the slot and press down on both
ends until the latches are fully engaged with a click.
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Chapter 6 Hardware removal and installation