HDMI problems (I think) with V675
My setup (which was working fine until a few hours ago!):
Yamaha TSR-6750 (aka RX-V675)
Panasonic VIERA TC-P65ST50 65-inch TV
Cox Communications Cisco Cable box/DVR
Sony BD player
The Yamaha is the heart of the system, with the two components plugged into it via HDMI, and the output of the AVR plugged into the ARC HDMI input of the TV.
It had been working fine just like this for years until a power outage for about 30 minutes this afternoon. Now, I don't get picture or sound from either of the sources through the receiver to the TV and speakers. Picture is black, and occasionally a green screen with some snow pops up then disappears to black again. No audio.
When I unplug the HDMI cable from the TV, sound from the cable box plays through the receiver's speakers for a few seconds, then stops.
I've plugged the cable box straight into the TV, and get an image, so the box and TV are fine. The problem seems to be the HDMI handshaking between the components.
I use a Harmony remote, and the order in which it powers them up has always worked, but not now. I've tried powering them up in other orders, but without success.
I haven't tried a factory reset on the receiver, since I didn't want to have to redo my speaker settings unless I have to. Would a reset help?
Any ideas on fixing this? Any thoughts why a power outage would have caused this?