Are you able to get the on-screen display menu when you press the menu button on the remote? This would tell you if the HDMI connection to/from the TV and 975 is good.
If you can get the menu, then the trouble could be the connection(s) between your HDMI source device(s). try reconnecting them. If this has no effect, you'll have to contact Outlaw customer service.
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Main HT <> 976 <> 7200 <> Ultra-X12 <> sapphire ST2 mkII RF/LF <> sapphire SC center
sapphire ST2 mkII SBR/SBL <> sapphire SS SR/SL <> Verizon/DVR <> Vizio M70Q7 <> Oppo UDP-203 <> Amazon 4k Fire TV