I have a yamaha RX-V769 receiver with HDMI inputs from an Xfinity DVR box, Apple TV, sony blu-ray and XboxOne. The receiver outputs to a panasonic plasma TV. I've had the same setup (except for the xobxone which was purchased last year) since I bought the receiver in 2016. It has worked perfectly until last week. While on vacation, a passing storm led to power outage of several hrs. When I returned home and attempted to watch TV, I found that no matter what input I picked there was no picture, but sound. However if I plugged the devices directly into the TV, everything displayed as expected. I tested the HDMI's and they all seem to work perfectly. I've unplugged the unit, removed and replugged the HDMI's, nothing. I've performed a hard reset of the receiver, and still no picture. I also had an older yamaha receiver(RX-V663), which I used in a similar set up in another part of the house which is having the same issue. Any other suggestions to try other than sending them in for repairs/replacing them. Both set ups were plugged into power strips with surge protection. The only affected devices appear to be the receiver.