This iMac here does not shutdown all the way. No, it is not a PRAM or CUDA / reset issue. I believe there is a faulty part in the unit preventing the green light on the monitor from not turning off when the machine is shut down. This also causes the monitor to not come on, unless the unit is unplugged momentarily.
My belief is it is being caused by a faulty relay somewhere, possibly in the power supply. Does anyone have any information to confirm this suspicion? If so, what is the suspected part? I could only find *ONE* relay in the entire machine, which is located right next to the main fuse on the power supply PCB. Am I overlooking something? Does anyone know if this is the relay that could be causing the problem?
Any technical information related to this issue is much appreciated. Thanks.