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Level 7

Can't get Roku Premiere to Work on Seiki SE421TT T.V.

I have a Seiki SE421TT T.V. that I am trying to connect a Roku Premiere too.  It has HDMI ports; but, when I plug it in, nothing happens.  TV just says there is no signal.  I have two other TV's with Roku, and when I initially plugged in the Roku, it showed the Roku home screen.  Can't get anything to come up on the Seiki, Are there older HDMI interfaces that Roku won't work with?  The Specs on the TV states it has "19 pin HDMI Type A" inputs.  Specs also state it excepts 1080i, 1080p, 480i, 480p, 576i, 576p, and 720p input video formats. Anyone have any ideas?

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