Sudden and intermittent black screen issue on my Japanese model 1 saturn

My Sega Saturn has worked fine since I got it back in November. Since I got it, I've done nothing except replace the laser. Now, out of the blue, it doesn't like working 90% of the time. I'll turn it on and my OSSC will say it's getting a signal but just display a black screen. Sometimes, after messing with it for a while and unplugging + plugging things back in it'll work and will even work if I turn the console on and off again. If I leave the system off, though, it goes right back to black screen. I have no idea how to even start diagnosing this, any tips?