after ni-wumpf install, close encounters displays all flash between 0 and 320,000. I can scroll thru menus but credit button does nothing. There are no selections on players 3 or 4 displays when scrolling the menus which appear in player one display. New power supply has all good input and output voltages. Installed new cable for PS to Ni-wumpf and Ni-wumpf to driver board. When not in diagnostics mode pressing the credit button generates an audio sound. This board was sent back to Ace and he sent it back to me stating it was good. What am I overlooking? Thanks in Advance!