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It looks like this was fixed by replacing the HDMI cable. I suspect that some of the HDMI cables that I had were the old standard rather than the newer high speed HDMI cables. The old standard only supports up to 1080i while the newer ones support 4k resolution.
The GPU is built into the CPU. I'm not using a video card. Power cycling the receiver turns the video back on so I'm thinking it's the connection there somehow but I don't know what to look at exactly.
I've recently built a PC to be used as a HTPC in my living room. The PC is connected to my Yamaha RX-V675 receiver through the HDMI port. When I watch movies the video intermittently goes black but the sound remains. This is fixed by powering the receiver off and then back on. The receiver...