IMac will turn on, but won't boot unless I wait until the next day

I've searched this forum, but can't seem to pinpoint my problem. I received this iMac for my office last March, and everything worked just fine. Lately, for the past 3-4 months, I can turn it on in the morning and everything runs fine.
I turn it off in the middle of the workday, thinking I won't need to use it for the rest of the day.
Of course, something comes up, and I need to turn it back on. When I press the button to turn it back on, nothing happens. Just a black screen and if it's quiet enough, I can hear the hard drive running.
It won't boot until I come back the next morning, almost as if I'm giving it time to cool off.
Any ideas?

Turn off Energy Saver and use Screen Saver instead. Energy Saver is sensitive to certain non-Apple USB devices and may cause such a problem.

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