IMac display doesn't turn back on after sleep

This is a new problem on my two-year old iMac, and didn't happen before. What is happening with my iMac is that when it goes to sleep and the display turns off, the display doesn't turn back on when I move the mouse, press the keys or the power button.
It happens only after around 12 hours or so of inactivity, it seems. I have to reboot the iMac to force the display to turn back on. I think it is display issue, not the computer lockup because I checked which logs were written in /var/log - system.log was being written until I rebooted the iMac. However, I didn't see any information in there around the same time that I tried to turn the iMac back on.
Any ideas on how to debug the issue.

Hi dailyjoe
1. Reset your SMC exactly as instructed in the following article:
http://support.apple.com/kb/HT1543
2. It would be normal for you to have to startup your iMac if it lost power while in sleep mode, look at the box "Start up automatically after a power failure" in the Energy Saver preference.
I have always left the box for "Start up automatically after a power failure" unchecked and do occasionally find the iMac is shutdown because the power has gone off. I would suggest leaving the box unchecked, it's better than having the iMac going off & restarting multiple times if you are having bad weather or power issues.
Dennis

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IMac display doesn't turn back on after sleep

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