Lenovo ThinkCentre M57 Hardware Maintenance Manual - Page 100
Replacing, power, supply
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Replacing the power supply Attention Never remove the cover on a power supply or any part that has the following label attached. Hazardous voltage, current, and energy levels are present inside any component that has this label attached. There are no servicable parts inside these components. This procedure describes how to remove and replace the power supply. 1. Remove any media (diskettes, 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 the cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. See "Front connectors" on page 84 and "Rear connectors" on page 85. 4. Remove the four screws at the rear of the chassis that secure the power supply. 5. Open the computer cover. See "Opening the cover" on page 88. 94 Hardware Maintenance Manual