====== Hardware teszt ======
  * http://www.info.apple.com/support/aht.html
  * https://github.com/upekkha/AppleHardwareTest
  * http://www.macissues.com/2014/03/21/how-to-run-and-interpret-apples-hardware-tests-on-your-mac/
  * https://www.raymond.cc/blog/memory-test-for-macos-x/