Lenovo ThinkCentre 7515 Maintenance Manual page 162

7. Reconnect the external cables and power cords to the computer. See "Locating
8. If you have replaced the system board, you must update (flash) the BIOS. See
9. Some FRU replacements require the configuration to be updated. To update
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connectors on the rear of the computer" on page 125.
"Updating (flashing) the BIOS from a disc" on page 380.
your configuration, see Chapter 6, "Using the Setup Utility," on page 49.