Video Or Logic Board Issue Imac Intel 27 Emc 2429
Chosen Solution One day while I was working during my lunch break, my iMac went into sleep mode (as usual) but when I came back I could only hear the noise of the fans but there was no way to turn it on again. I opened and checked the diagnostic LEDs and LED #1 lights up correctly when the Mac is connected to the electricity, LED #2 lights up correctly when I press the start button, but LED #3 and #4 do not light up (#4 flashes if the LCD is disconnected)....