IMac does not turn back on from sleep mode

Hi all,
I've having a problem sometimes that my iMac won't turn back on after I put it into a sleep mode. This does not happen everytime. After the machine does not turn back on, the only workaround is to unplug the power cable and connect it back. Then I'm able to turn on the iMac. After the machine boots up, and I will get the crash report said that the machine does not turn it off properly.
I tried to reset the SMC before and it did not resolve the problem.
Any idea?

One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems
/System/Library/LaunchDaemons
/Library/LaunchDaemons

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One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
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IMac does not turn back on from sleep mode

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