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No power

A Faulty fan or faulty battery connect can cause No power to computer On any Apple computer
  • Computer does not start up
  • No image appear on internal or external display
  • No startup sound
  • No sound from fans,optical drive or Hard drive
  • No green light on caps lock on keyboard led
  • Laptop no Green light.
 
 
On imac and Mac Pro apple have install 4 LED inside the computer to idental which part are working.
 

Most likely fault are

  1. Power supply if not sound heard
  2. Logic board
  3. Graphic card
  4. Airport card or sound card
  5. Hard drive.