Hi I have a faulty imac a1224. When turned on, 1 LED is constantly on, and also 2 and 3 diagnostic LEDs light up every 5 seconds, and then they immediately go out. I checked the voltages of the power supply when trying to start and they correspond to the declared. I think the fault is somewhere on the motherboard, but I can't find boardview for this model on the forum. Only .sch, no .brd. Can someone share? Thanks