Lenovo ThinkCentre 7515 Hardware 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 your computer" on page 125.
"Updating (flashing) BIOS from a disc" on page 278.
your configuration, see Chapter 6, "Using the Setup Utility program," on page
51.