the black and red wires are used for the zone, so twist them together and you should be able to set.
clean the area down and replace the PIR (be wary of false alarms mind).
you need to isolate the white and green wires as if they are shorted it will blow the panels fuse(if glass fuses), if the ceramic fuses they will reset when the power isn't shorted.
I have finally received replacement pir. Just one slight problem , the terminals on the replacement pir are different than on the old one. I no