Power button does not react iMac Core Dua 20"

Hello,
I just purchased an iMac 20" intel Core Duo. I leave the machine to go to sleep during the night. Almost everyday when I want to start the next day my iMac does not wake-up pressing "enter", moreover the power button does not even respond. I have to unplug the power cable and after a few seconds the powerbutton can activate the Mac again. Can anybody help or should I immediately return for repairs?
Erik

Welcome to the Apple Discussions.
One question. Is your iMac a Core Duo (no longer made) or a Core 2 Duo?
Try resetting the System Management Controller;
Intel-based iMac, Intel-based Mac mini: How to reset the System Management Controller

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Link to image 1
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Power button does not react iMac Core Dua 20"

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