Thanks guys, problem solved. A couple have guessed it...loose power connection to the mobo; it felt like it was seated but I didn't get the locking click. I feel rather silly now /embarassed for a nub mistake.
Here's hoping there'll be no more hiccups!
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"Punk rock had this cool, political personal message. It was a bit more cerebral than just stupid cock rock, you know"
-Kurt Cobain
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