IMac shut down playing radio over itunes

An iMac from 2009. It was left alone over an hour playing a radio station over itunes. When came back the computer had shut down, & can be turned back on. Touching the keyboard didn't wake it up. Tried option, command, escape. Pressed on switch in back & nothing happened. Unplugged & replugged it, & still wouldn't start.
I don't have all the details.The computer is in CT & I'm in NJ.
Any suggestions?

Leave the power & all cords/peripherals unplugged from it for an hour, plug the power back in & see if it boots up.

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