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  Apple laptops' / macOS manual hardware test howto: keyboard, sound, scree
  Keyboard test: Open and use the Keyboard Viewerhttps://support.apple.com/kb/PH25242?locale=en_US1. Click the Input menu in the menu bar, then choose Show Keyboard ...
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  How to create MacOS installation USB disk.
  Use a working MacOS system, download "Disk Drill" from internet and install it. Download MacOS installation application from apple's APP ...