The following figure shows the location of the jumpers on the system board.
System Board Jumpers
NOTICE: Before changing a jumper setting, verify that the standby power
light on the system board has turned off. Otherwise, damage to your computer
or unpredictable results may occur. To locate this light, see "System Board
Components" or the interior service label.
To change a jumper setting, pull the plug off its pin(s) and carefully fit it
down onto the pin(s) indicated.
The following table lists the system board jumpers and their settings.
DELL'S NORMAL TERMS AND CONDITIONS APPLY AND ARE AVAILABLE ONLINE OR UPON REQUEST. While all efforts are made to check pricing and other errors, inadvertent errors do occur from time to time and Dell reserves the right to decline orders arising from such errors.
Product image on the page is for your reference only.
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jumpered 
unjumpered