so which predator board do you have? the Angel V3? does your board look like the board on page 4 of the v3 manual? http://www.theangelguy.com/manuals/angelv3.pdf
if the V3 board, are dips 5 and 6 on?
dip 2 on?
you can always try to reset the board and see if the port works. or put a multimeter up to the noid socket on the board to make sure it's putting out juice for the noid.
or call up theangelguy and see if they have any ideas.