While you wait for answers, we may have found some information which could help you.
Click here for Laptop Brightness Screen
how to fix my g520 laptop?
dell inspiron 5040 plugged in not charging?
Dell latitude c400 intermitent lines on screen?
How to fix dell Inspiron 5040 laptop windows 7?
My laptop is showing it is not connected to the network, but it is?
The Dell adapter can't be recognized?