Dell Inspiron 1546 (Late 2009) - Manual (Page 53)

17. Replace the hard drive (see Replacing the Hard Drive ).
18. Replace the battery (see Replacing the Battery ).
19. Turn on the computer.
20. Enter the service tag (see Entering the Service Tag in the BIOS ).
Entering the Service Tag in the BIOS
1. Ensure that the AC adapter is plugged in and that the main battery is installed properly.
2. Turn on the computer.
3. Press <F2> during POST to enter the system setup program.
4. Navigate to the security tab and enter the service tag in the Set Service Tag 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.