Power supply replaced. Still won't turn on

I just replaced the power supply in my iMac,but it still will not turn on. Am I doing something wrong? Do I have to wait for the computer to sit plugged in for a bit? Or do I need to replace the power switch or the power cord?or is it possible my logic board is bad also?any advice would be very helpful.

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Why did you replace the power supply? What do the diagnostic lights to the right of the RAM slots show you? What was the source of your replacement part?

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