Lenovo ThinkCentre M55 (English) User guide - Page 35
Opening, cover
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Opening the cover Important: Read "Important safety information" on page v and "Handling static-sensitive devices" on page 15 before opening the computer cover. To open the computer cover: 1. Remove any media (DVDs, CDs, or tapes) from the drives, shut down your operating system, and turn off all attached devices and the computer. 2. Unplug all power cords from electrical outlets. 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. 4. Remove any locking devices such as a cable lock that secure the cover. 5. Press the buttons on the sides of the computer and pivot the cover upward to open the computer as shown. Chapter 3. Installing options 19