HT1349 iPhone 4s has totally locked up with black screen.  No buttons respond. Prior to this trying to initiate a text message, the onscreen keyboard would not respond.  tried other functions which led to overall black screen, no response to any buttons

iPhone 4s has locked up with no response to any buttons.  First occurrence on a 1+ month old iPhone

Have you tried a very basic troubleshooting step well-outlined in the User Guide called reset?  Hold the on/off switch and the home button togeter (usually around 30 seconds) and don't let go until you see the Apple logo.
I highly recommend reading the User Guide to learn about other general troubleshooting steps.

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