N64; there is sound but no video

I plug my N64 into the tv and there is sound for the game yet there is no video just a blue screen(I tried this on 2 Hisense TVs and 2 of my Vizio monitors). This blue screen shows up on every device. I even bought a mini av to HDMI off amazon and it comes up with the same results how do I fix this? Is it the game? The Av Cables? or something to do within the n64? I just bought some new AV cables off amazon for 8 dollars and Ill see how that works but so far nothing but sound. It’s so disappointing as well. I only have one game right now just bought Pokemon Stadium as well. So, Ill try to use that game.