1- how old is your laptop?
2- is it refurbish?
3-Is it still under warranty?
You have 2 choice
1-return the laptop RMA if its still under warranty
2-Ship Dell craptop back saying that it has a hidden vice (faulty parts in laptop). Claim your money back...
Then buy an Asus laptop: you shouldn't have any trouble with them
p.s here's tons of reason why not to buy Dell/Hp/Gateway/toshibas!!!http://www.computing.net/answers/hardware/why-are-dell-pcs-bad/6434.html