While you wait for answers, we may have found some information which could help you.
Click here for Power Issue ErrorHow to fix dell Inspiron 5040 laptop windows 7?
dell inspiron 5040 plugged in not charging?
device driver downloads for Dell Latitude E6400 PCI Port & PCI Controller?
audio device drivers for Dell Latitude E6400?
how to repair my blank screen?
Right Click pad on my Lap top does not work, can this be fixed?