Dell Inspiron Zino (300, Late 2009) - Manual (Page 40)

16. Turn on the computer.
17. Enter the Service Tag (see Entering the Service Tag in the BIOS ).
Entering the Service Tag in the BIOS
1. Turn on the computer.
2. Press <F2> during POST to enter the system setup program.
3. Navigate to the main tab and enter the service tag in the Service Tag Setting field.
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CAUTION: Before turning on the computer, replace all screws and ensure that no stray screws remain inside the computer. Failure to do so may
result in damage to the computer.
NOTE: After you have replaced the system board, enter the computer's Service Tag into the BIOS of the replacement system board.