Quoted from Theonlylilo:Then I put a Blackout romset for the next test (the romset is fully working) but, once powered, the two LEDs don't flash. They come on and turn off quickly...
That's normal and a good sign. You'll need to do some more investigating to see if it is totally up and running correctly. Easiest way is to attach a driver board and put it in a game. If you have other equipment available you can test it on the bench.