No Output Devices Found and Track Pad Issues

I bought my Macbook Pro in mid-November 2011.  Yesterday I noticed that my Macbook did not have any sound and when I checked System Preferences it gave me the dreaded "No output devices found" message.  I could hear a start up sound but nothing after I have already logged in to any of my accounts.  This is the first time I encountered it and I did some research so I have already done a PRAM reset, permission repair and I even created a new user account to see if I will encounter the same problem.  Same thing on the other user account, still no sound.  I also found out that the sound would only come out with a USB headset.  Headsets with jacks won't work either.
I brought the unit to a service center and they advised me to reinstall OS X Lion and I did.  There was sound right after I reinstalled the OS.  However, it was gone again when I did a reboot.  I also noticed that my track pad won't respond on certain occasions and I have to do a force shutdown by pressing the power button.  What could be the problem?  I am fearing that this is a hardware issue.  I prefer not to have to bring the unit to a service center, wait for a week to get it back then only to encounter the same problem in the future.

Try resetting the PRAM and SMC...
PRAM Reset:
http://support.apple.com/kb/HT1379
SMC Reset:
http://support.apple.com/kb/HT3964
Hope this helps!

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