IMac went to sleep and refuses to wake

Just bought my iMac this afternoon!
Was working fine until I left the computer idle for 30 minutes, and now, the screen is black. When I rebooted the sound rings but nothing on the screen.
I rebooted, re-plugged power cord/keyboard/mouse, I pressed command, option, P, and R... nothing worked.
Would appreciate some help! Thank you

Hello and Welcome to Apple Discussions.
It sounds like you got a lemon. I'd return it to the retailer for a replacement.
mrtotes

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Ops I replied to myself in error.....
Tom:
I performed the steps indicated but this morning when I clicked the mouse and hit the space key and clicked the track pad again as before nothing happens.
I hold the power button for a few seconds and the screen fills as if the computer was normally awakened but it is locked up.
Then I have to shut it down with the power button and then power it up as a reboot.
Not good...SMC reset didn't work....Throughout the day yesterday I put the computer to sleep and woke it up normally. It seems to be a overnight problem.
Am I going to have to shut it down everynight?
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