DigDug Upright

[pacmanmedic]

So my DigDug has a bunch of garbage on the screen and has a "ROM 2" notice on it.  I have checked voltages at the board.  I reseated the ROMS, replaced the sockets, checked the power supply and reflowed the sodder on the board.  No change whatsoever.  There is also a noticeably loud hum when I turn on the game that wasn't there before too.  The fuzes are all tested and good.  I'm completely stuck.  Could it be a bad fuze block, am I missing something on the power supply which is causing the hum?  I've even gotten a couple of "junk" boards and pulled the ROMs from it and get no change.  Suggestions?