Very weird can anyone help?

[Jeresmith27]

Hi guys new to the forum for this reason specifically that I'm having. But hopefully this is a great resource.
I have a 2017 imac 5k i5 40gb. I only use it for video editing. So last night I was importing video clips into final cut from an external drive.
A few minutes into it I realized that I was importing optimized very large files instead of my normal proxy files. So right after I noticed that the dreaded "disk almost full" tab popped up. So i stopped the import all together, and checked the storage to see I had 4gb left out of 1 TB which was strange because I barley keep any clips on the internal drive.
So I went and deleted all my internal video libraries and projects to relieve some space. So after all that said now my whole dock and all apps have blank pages with a compass over them, I can't open system preferences and every time I try to open an app it says "cannot open because it may be damaged or incomplete" I don't know if one has anything to do with the other but I tried everything to fix it over the phone with apple with no success. Reset a couple things which I can't remember the name. Then finally reinstalled OS but no luck.
Has anyone ever heard of anything like this?

 

[960design]

You may have deleted a bit too much. Seems like you grabbed a couple of important .library files necessary to the operation of the OS.

Then finally reinstalled OS but no luck.

Try internet recovery.
https://datarecovery.wondershare.com/mac-recovery/internet-recovery-mac.html

 

[SaSaSushi]

Have you tried to rebuild the launch services database?

Launch Terminal.app

Enter this command:

/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -seed

Wait until it returns to the $ prompt. It might take a few minutes.