Since it shows the loading screen just fine I'd first suspect that it's a desktop resolution problem. Make sure your running at 60hz and try a resolution like 640x 480. It accepts vga?
I know with most of my monitors that accept vga and newer video cards I have to first start the computer with no monitor connected, hook up a dvi-vga addapter so the computer doesn't recognize new hardware and just keeps outputting analog, then connect a computer monitor, switch resolution, then plug in my arcade monitor. Might help you. The key is making sure it doesn't recognize the new monitor because then it'll revert to default when you unplug it which is a much higher resolution. You don't have to do this everytime just the first time and shutdown and it should save your settings for the analog video output.