Why does the mac just shut off

We've had the iMac for about a month and love it except about 2 weeks ago it just started turning itself off.  It doesn't happen when anyone is around, but we'll have been using it and leave it running and come back anywhere from a couple of hours to days and it'll be dead.  We have to unplug it and plug it back in.  Any help?

Reset the SMC > http://support.apple.com/kb/HT3964
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Press and hold the power button for 5 seconds.
4. Release the power button.
5. Attach the computers power cable.
6. Press the power button to turn on the computer.
Then if the problem persist first run the Extended Apple Hardware Test as out lined in > http://support.apple.com/kb/HT1509
and/or contact Apple Support, your Local Apple Store or Authorized Apple Service Provider. > http://www.apple.com/support/imac/service/
Dennis

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