IMac won't start at all

I have a relatively new iMac 21.5" (from November '09). It's configured to go to sleep mode every night at 11pm. Two days ago I wanted to start it again after it had gone to sleep mode but it didn't respond to anything. Out of ideas, I pushed the power button for a few seconds to shut it down. But afterwards it wouldn't start again. After trying different power cords I gave up.
I changed absolutely nothing, but the next morning it booted up just fine and continued to work the whole day. But in the evening the same problem came again. I tried everything, reset the SMC, but until now nothing happens when I push the power button.
Do you have any ideas what I could try next?
Message was edited by: bristleworm

Reset the SMC again following these instructions > http://support.apple.com/kb/HT3964
+1. Shut down the computer.+
+2. Unplug the computer's power cord.+
+3. Press and hold the power button for 5 seconds.+
+4. Release the power button.+
+5. Attach the computers power cable.+
+6. Press the power button to turn on the computer.+
Then if and when you get it up and going in addition to disabling the Schedule sleep settings also note: if the *❐ Allow power button to put the computer to sleep* is checked then the first time you push the power button the iMac will sleep instead of shut down.

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