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The WIFI switch on the Latitude E5400 is located on the front edge of the system to the left. You can move it to the right or left to turn on or off.
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Do you run your notebook plugged in all the time? I've done that and continue to but I shouldn't. Battery run items are meant to be run on battery and then have the charge run down to a low level before plugging the charger back in. By leaving the notebook running on power all the time, you are actually conditioning the battery to hold less of a charge. You reminded me of an error I make often. Something s/b done for tablet, cell phones or any item that gets recharged.