Mysteriously it has now begun to work (ie - turns on via remote and/or front power button). I'm pretty positive it wasn't an over-heating issue since there would be extended periods of time when it was not used and I would randomly test it and it wouldn't turn on. So it wasn't a situation where it had been used extensively and then the next time it didn't turn on.
Another member on the board suggested connecting it to ethernet and get the newest firmware upgrade - he was under the impression there was a patch that was fairly recent that would fix this issue. But before attempting that fix it started powering up without issue. So again, no clue what caused it or how it even corrected itself.
Thx for responding though...appreciate the insight from others who know a lot more than me!