Lenovo ideacentre All-In-One 520 Hardware Maintenance Manual page 28

Left and right view
The following illustration shows the location of connectors, controls and components on the left and right
side of the computer.
1. USB 3.0 connectors
2. Optical drive （Optional）
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ideacentre All-In-One 520 (27 inch) Computer Hardware Maintenance Manual
3. Power button
4. Cable clip