MS8+ hdmi issue


Ok my MS8+ will not work on my plasma tv ,hdmi cable good ,my ps3 works fine with the hdmi cord. This is what happens only the first time when i power up on plasma after it working on my led fine ,I plug it in the ms8 comes up for 5 sec then i hear a zip in tv and a snow line comes across tv. I have turned off then on a couple times left on for an half hour nothing. I have also changed tv hdmi setting to anolog, digital, nothing. Everything works on my plasma ps3 ,laptop.??? When i hook my box up to my led tv with multiple hdmi ports it works fine. Can anyone help me id like to hardwire internet to my plasma have slow wifi. Thanks JR