Energy and Screen Savers Don't Seem to be Working

I have a 27" iMac (early 2011) running Lion. No matter how long I set the Energy or Screen Savers for, the screen dims after less than five minutes of inactivity then goes into screen-saver mode after another couple minutes.
Any suggestions?
Thanks,
Lloyd

Hi Lloyd,
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.
If that doesn't do it, (not on 10.7 to see if it's the same, but older OSX info)...
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,  then move these files to the Desktop.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
/Users/YourUserName/Library/Preferences/com.apple.systempreferences.plist
/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
/Library/Preferences/SystemConfiguration/com.apple.AutoWake.plist
(Then Trash the original of these last two, as "moving" them only copies them.)
Then reboot once more.

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