No power something blew while diagnosing

I opened up my iMac to diagnose whether I need to replace the power supply. I plugged it n to find the LED lights. When I pushed the power on button something blew on the power supply board. Will I have the same problem when I replace it? It smelled like something burned. I need to get my Mac up & running again.

I have an iMac A1224 emc 2133 2.4 gh

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It's the power supply. But why would pushing the power on button cause it to blow a piece off of it?

Post some images of your board and the component with your question. That way we can see what you see. Use this guide Adding images to an existing question for that

It's the power supply. But I don't understand why it popped a soldered piece when I pushed the power button. It also smelled burnt.

It's the power supply, but I have further questions in my comments.

Jan, sounds like something shortened it out. that is why the soldered part came off. Not quite sure what your question is. No, it will not happen on a new power supply.

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