imac led code errors (tutorial)

[esmerlin]

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?

 

[ThienBui]

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.

 

[chipmunk]

LED 1 = Standby power
LED 2 = Power on the Motherboard
LED 3 = Video card detected
LED 4 = LCD detected