While you wait for answers, we may have found some information which could help you.
Click here for Inspiron Charging Iconaudio device drivers for Dell Latitude E6400?
how to repair my blank screen?
device driver downloads for Dell Latitude E6400 PCI Port & PCI Controller?
My laptop is showing it is not connected to the network, but it is?
My Dell Inspirion Windows 10 laptop has no network socket?
The Dell adapter can't be recognized?