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The Dell Latitude E6400 was Dell's mainstream corporate 14.1" notebook introduced in August 2008.

wifi not working but wifi light always on

wifi light is on continiously but wifi not detect

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You may be missing drivers for your pc. If you have another PC I would look the model information up on dell and download all of the drivers listed with wireless and install them one by one (should only be 2-3 max). Also check in device manager to make sure your computer is detecting a wireless network card.

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