Quoted from BuckNaked:Turned the machine on today, but didn't play it immediately. Came back like an hour later, still fine. Played one game, and now it does
this.
It is always the same eye with problems, maybe it's just a faulty screen? Maybe it's too sensitive to voltage fluctuations (because it only seems to happen during game play). I will contact F-2Nero also, see what he says about this.
Potentially have a look here for a new screen. There are a few different ones. Don't have the mod but from what I've seen it's just one of these products running the, possibly modified, demo code from a teensy.