Dell Inspiron M431R (5435, Mid 2013) - Manual (Page 50)

50 | Replacing the System Board
Entering the Service Tag in system setup
1 Turn on the computer.
2 Press <F2> during POST to enter the system setup program.
3 Using the arrow keys, select Enter Setup and press <Enter>.
4 Navigate to the Main tab and enter your computer’s Service Tag in the
Service Tag field.
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