I'll add my experience...
Both of my standup cabinets randomly go to a 'black screen' on startup, and I have to bump the joystick or hit a key to get it to like.. wake up and then load the main view and start working. But it'll just sit there for hours if I don't touch it. Oddly, my sitdown Daytona USA twin (two PCs running LB/BB) doesn't have this issue.
All four use LEDBlinky, standups have Ultimarc IPac Ultimate I/O boards, sit down drivers have IPac-2 boards.
All four use startup videos as well. The two standups share a video, and the two driving cabs share a video.
I never considered it to be a startup video file problem, but maybe?