Why won't my macbook pro sleep when I close it?

To anyone who can help:
My macbook pro used to go to sleep mode when I closed the display.  Now it does not.  Every time I close the display the computer keeps running.  If I do not manually put it into sleep mode before I close the display, when I come back to it the battery is dead (obviously given that the power cord is unplugged).  I have looked at all the settings in power saver in the system preferences panel, but there are no options regarding sleep mode when the display is shut.  This computer is still quite new, I'm running OSX 10.7.4.
Is there a setting I haven't found somewhere?
If not, is there some sort of support that Apple will offer?
Thanks to anyone who can help.

For:  Responding to display lid opening and closing on portable Macs
Reset SMC.     http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
Best

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