I just rebuilt my retropie and confirmed its worked fine when connected to a standard 1080p computer monitor or when connected directly to my tv. However, when I connect it to my AV receiver (Sony STR-DH770) which connects to my TV, the display doesn't work. I'm using the same cables, and I can ssh to it while its on, and I've tried all of the 4 HDMI input ports on the back of the AV receiver (and they all work for all other devices like roku, xbox, etc...). I just cannot get the pi's HDMI display to work when going thru my receiver to the tv?
How can I troubleshoot this?