I agree with Xenonman. Sounds like a handshake issue. The TV should be turned on first, as that is the device that is most responsible for a successful handshake.
How long is the HDMI cable run to the TV? If it's too long, over 25ft, you may need an active HDMI cable.
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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