I tried everything and my Nintendo 64 won’t appear on screen

So I have 3 nintendo 64s, one that was locked in storage years ago, another that was preserved, and the third one was a gift thats a collectors item.

Anyways I decided I wanted to play some of my old games, and to my surprise no picture. Whats weird the light still comes on, and they look in well kept condition. So i thought to myself maybe it might be the av cables, I ended up buying 3 different kind, so I thought it might be my tv. I ended up buying an AV2HDMI AND STILL NO PICTURE. I’ve tried 3 different tvs, and still nothing. I even picked up a few games to test if it was the console, and nothing. Then I started watching YouTube videos, I’ve cleaned the cartridges and the console, I’m at my wits end, AND STILL NOTHING. I would understand one console not working, two maybe, BUT THREE! Anyways I finally just decided maybe I turn to help by asking here, and hoping for a response. So I’m open to thoughts.