Chosen Solution
Whenever I turn on my mac, the finder functions normally. But after a few seconds, the Finder stops working. Whenever I click it again it says “The application Finder can’t be opened.” Then it has a bunch of numbers (-10810) after that. I can’t download any application on it!
With the laptop on Target Disk Mode (booting from another Mac drive), try moving some files to another drive. Sounds like your Mac’s drive is too full, which caused apps and Finder to not work.
