Hi everyone

Thanks for the interesting forum.

Can anyone help me identifying a burnt out diode?

Here is the story thus far.....

iMac would not power up. The On Off LED in button just cycles on and off. Taken to Apple Repair Centre. Swollen caps replaced with new Rubycon MCZ series. This was done under Apple's extended warranty for this problem.

Then 3 months later the iMac again would not power up. On Off LED in button just cycles on and off.

I took it again to the Apple repairer to be told unfortunately...