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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
- Power supply if not sound heard
- Logic board
- Graphic card
- Airport card or sound card
- Hard drive.