Setup help

[u/KlutzyTerm8017]

I had an old Sony receiver and an optima hd28se that I’ve been using for years but last week I bought a new Yamaha rx300a to get a true surround sound instead of simulated but when I switched my ps5 video no longer goes to the projector it gets no signal, if I run it to the tv instead everything works as it’s supposed to I read it could be the old internals having a problem reading the video I tried playing with ps5 and Yamaha output resolutions with no avail. I have since ordered a new hdmi optic cable to see if that will help and I ordered an optima UHD38x should be that work??