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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Thanks
Craig

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If you have more than one user account, these instructions must be carried out as an administrator.
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Some users have reported solving this problem by resetting the NVRAM (PRAM.)
If you've installed something called "iCleanMemory," or any other third-party software that is supposed to "clean" or "free up" memory, remove it according to the developer's instructions after backing up all data. Reboot and test. If there's no change, continue.
Please read this whole message before doing anything.
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Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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

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