off topic, how do you know the SFA3 game isn't working ?
if the cabinet is a medium res monitor, I can understand why it wouldn't display a picture as SFA3 is a low res 15k JAMMA game although it would make no sense fo it to have a 15k JAMMA game installed in a medium res environment - but it should still at least power the CPS2 board, if the fans kick in on the CPS2 but you get no sound from the game then I would hazzard a guess that the CPS2 has commited Capcom Suicide (the internal battery has died), if however you can hear it say "this is Street Fighter Alpha 3" then i'd be confident the game works okay. Even if the board has committed suicide, you can still have the eeproms re-programmed by Razoola from CPS2Shock
will the SFA3 and marquee be for sale at any point ? SFA3 blue boards aren't as common as the Japanese green ones. it would be worthit to someone to get the board pheonixed