My MacBook Pro does not "chime" on Restart or Startup

My new MacBook Pro (w/ Mac OS 10.7.1) does not "chime" on Restart or Startup.  I can get it to "chime" if I perform the PRAM reset procedure but I shouldn't have to do this everytime to get the MacBook Pro to chime on Restart or Startup.  Any suggestions to fix this problem?

I just updated my OS to 10.7.2 ... and then, I tried your latter suggestion (in the "Sound Preferences", I unchecked the mute checkbox to the right of the output volume slider).  I did a "Restart" and I heard the "chime".  YEAH!  I had tried the SMC reset several times before and that didn't work.  Thanks for your suggestion about unchecking the "mute" checkbox in the Sound Preferences.  I'll try some more "Restarts" and "Startups" over the next few days and see if your suggested fix continues to work.

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