While you wait for answers, we may have found some information which could help you.
Click here for Dell Inspiron 1525device driver downloads for Dell Latitude E6400 PCI Port & PCI Controller?
audio device drivers for Dell Latitude E6400?
DELL won't turn on?
Right Click pad on my Lap top does not work, can this be fixed?
My Dell Inspirion Windows 10 laptop has no network socket?
Dell latitude c400 intermitent lines on screen?