After a seemingly normal day of usage, I noticed the laptop making a clicking noise. It's prominent when I open the screen, but generally, holding it seems to produce the noise sometimes too. The laptop functions completely fine, everything runs fine. But this issue keeps giving me anxiety. I tried pressing the back cover, and if I press in a specific spot, I get the noise. 

The black arrow should give you a general idea where that spot is. When I contacted Dell Support, they made me run the hardware diagnostic, and it said that everything is fine. What do I do about this issue?