Im posting this cause im sure someone here will know
When I play tekken 2 in my war gods cabinet on my u2000 monitor its perfect the picture is clear and bright but my other 2 jamma boards when I play them the games are just so dark and not bright I have adjusted color pots , contract ,focus, and brightness but it doesnt make it any better anyone know what is going on
Just confirming again, you have DIP Switch Bank number 1 (nearest edge of board) with switch 1 set to ON and switch 2 to OFF right man? You have to I would think or you'd get garbage from it not syncing with the standard-res U2000 monitor.

Still scratching my head, too bud.
And you're positive that hard drive has the ability to work with both Medium AND Standard-Res as well right? I saw a post that said the (and I quote) "'B5' is medium
resolution only. 'L1.0' is switchable". Your new drive is a L1.0 then I presume?