Lenovo IdeaCentre 3 User Manual page 26

For access, do the following:
1. Remove the computer cover. See "Computer cover" on page 14.
2. Remove the front bezel. See "Front bezel" on page 15.
3. Remove the optical drive. See "Optical drive" on page 17.
4. Disconnect the signal cable and the power cable from the storage drive.
Replacing steps
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IdeaCentre 3 User Guide