Lenovo THINKSERVER 3821 - Manual (Page 209)

10. Install the power supplies (see “Installing a hot-swap power supply” on page
175).
11. Install and lock the left-side cover (see “Installing the left-side cover” on page
158).
12. Reconnect the external cables and power cords; then, turn on the attached
devices and turn on the server.
Chapter 7. Installing optional devices and replacing customer replaceable units 201