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imac led code errors (tutorial)

esmerlin

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i need help
I have an imac A1418 (all in one)
it has 4 LEDs on the motherboard, it has 1 on green and 2 flashes green, 3 and 4 off ... what can it be?
someone has a tutorial of the led codes in the imac?
 

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imac led error.jpg
i need help
I have an imac A1418 (all in one)
it has 4 LEDs on the motherboard, it has 1 on green and 2 flashes green, 3 and 4 off ... what can it be?
someone has a tutorial of the led codes in the imac?
not tutorial need check and test all.
 
LED 1 = Standby power
LED 2 = Power on the Motherboard
LED 3 = Video card detected
LED 4 = LCD detected
 
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