What is the cracking sound when I open my MacBook Pro lid?

When opening and closing MacBook Pro lid, it makes a cracking sound. Does anyone have an idea what it could be? It's not the hard drive because Geek Squad ran a test and everything passed.

Try this:  Loosen the screws in the rear of the MBP (by the hinge) and re-torque them.  See if that will alleviate the problem. You will need a 00 Philips driver.
Ciao.

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