While you wait for answers, we may have found some information which could help you.
Click here for Unlock Keyboard Laptopdell inspiron 5040 plugged in not charging?
how to repair my blank screen?
audio device drivers for Dell Latitude E6400?
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?