While you wait for answers, we may have found some information which could help you.
Click here for Laptop Screen LightHow to fix dell Inspiron 5040 laptop windows 7?
Right Click pad on my Lap top does not work, can this be fixed?
DELL won't turn on?
dell inspiron 5040 plugged in not charging?
My Dell Inspirion Windows 10 laptop has no network socket?
Dell latitude c400 intermitent lines on screen?