My IMac won't turn on and it's plugged in and the batteries on the mouse and keyboard work. What's the problem then?

I have an IMac and I tried to get on it this morning, but it wouldn't start when I touched the mouse pad. I tried this a couple more times, and then I tried it with the keyboard. I got the same results. I know there are fresh batteries in there so I didn't see what the problem was, so I tried turning it on, and I got no reaction. My IMac is plugged in and everything so what's the problem?

Make sure the outlet is OK. could have tripped circuit breaker.
Then try resetting the SMC
Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
If it still fails to turn on you need to make a Genisu Bar appointment at an Apple Store or contact Apple Support.

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