Internal hard drives are no longer appearing in the finder window

Hi everyone,
I'm a new macbook pro user and just noticed that my internal hard drives are no longer appearing in the sidebar of my Finder window. I have searched this issue and checked that the correct preferences are selected, never received any error messages and run Disk Utility and everything seems ok......except I still can't figure out why my devices aren't showing up!!
Any help with this is much appreciated!

FINDER PREFERENCES>SIDEBAR>EXTERNAL DISKS has the box checked?
Does the HDD icon appear on the desktop?
Does the HDD get recognized in Disk Utility?
I'm just trying to verify what your situation is.
Ciao.

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Internal hard drives are no longer appearing in the finder window

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