So that let me finally know that the screen actually worked and wasn't the problem! I unplugged the data ribbon cable and tried to power up the system, I got an error on the screen that said 'JAMMA JVS Error, no IO 1 found, no IO 2 found '. I tried to plug in VGA monitors to see if the screen was broken, but got no signals. I tried to toggle the 4 switches but that did nothing. I plugged an iPhone into the RCA audio cables and mp3s played back through the speakers. Power supply was good, one green light came on on the JAMMA pcb, the big banner light lit up, dvd green light flashed and the dvd was turning, fans all spun correctly. That's it, no text, no errors, nothing else, and no sound.

On power up, the screen flashed blue for a few seconds, then just stayed black forever. He said he bought it new in 2002 and it hasn't worked since 2007, and has been unplugged for years, so it's in pretty good condition. I bought a full Tekken 4 arcade machine on craigslist that didn't work at all, so the guy sold it for $100.

Download tekken 4 namco system 246