Lenovo ThinkCentre M720t User Manual And Hardware Maintenance Manual page 36

Figure 40. Installation order for memory modules
1. Remove the computer cover. See "Removing the computer cover" on page 23.
2. Remove the front bezel. See "Replacing the front bezel" on page 23.
3. Replace a memory module.
Figure 41. Opening the drive bay
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ThinkCentre M720t User Guide and Hardware Maintenance Manual