Inspiron 5555 monitor lines

I recently purchased an Inspiron 5555 laptop. Since day 1 when I wake it up the screen is covered in lines, it also happens throughout my use.  At times the screen will go black and I have to hit it to come back.  I can plug it into another source and that works fine but I have a laptop so I could work remotely. I tried returning within a couple weeks of buying but it took so long to get a response that the return time expired.

How can I get the screen to work on this  dell that I bought?  And don't give me the customer service phone number.  I don't have the hours to waste sitting on the phone.  I bought a new computer because I didn't have time for problems. Guess I should have bought something other than a Dell.