I am fairly sure the issue is with the cabinet, but I am experiencing problems with the monitor picture. This is a Sega Blast City that I had a 2931 NANAO in. When I turn on the cabinet, I get a really blurry picture (sometimes extremely bad) but after 20 minutes, the pictures comes into better (not complete) focus. Unfortunately, the chassis took out the tube itself a few month back. So I threw in my spare NANAO MS9 monitor. It is a tested good monitor that I tried in my Astro City. With it in the Blast, same blurry picture that slowly comes into focus. I am fairly sure its a cabinet issue. I rebuilt my power supply and even tried my spare power supply...same issue. I also tried swapping in a spare I/O board and spare harness. Not sure what else it could be.