I was messing around with features to what they did.  now I have a white screen. Can I undo this?

Hi all i'm brand new to mac. I was checking out features on the system to see what they do. I came to the disk readibility feature where i could determine if it read or read and write etc. im not sure what i did but upon exiting i was locked out ( a red minus displayed on the icon) of my hard rive contents. I couldnt even see what storage space was available etc... i freaked out and restarted the computer, now I have a white screen. How do i fix this?

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