Chosen Solution
Ok folks… I have an iMac a1224 with no power to the LCD. External monitor does not work either. I have replaced the following: Hard drive (currently blank until I can see to install OS) Power supply Graphics card (yes it can be replaced. It is not soldered to the logic board.) Logic board At this point I will not fail if I have to replace every darn component in the thing. There is no power to any of the USB ports or the external display port. Led 1, 2, and 3 all come on but never #4. Anybody have any advice?
LED #4 Indicates that the computer and the LCD display panel are communicating. This LED will be • ON when the computer is turned on and video signal is being generated. If the LED is ON and there is no image on the LCD display panel, the LCD display panel or inverter might be installed incorrectly or need replacement.
