Playback Wing 4

Can someone walk me through the setup of a Playback wing 4 to a Hog FB4 please
I can't seem to get any image from the screen although I can see it is active
No 4 logo on boot up - its a if the contrast is turned down
All other parts work fine - have tried all the usual - changed DVD - USB - connected in wings also used Hog4wing in Displays - tried Display 1 and 2 from hog - Tried other monitor from hog and it works fine
Any help would be great thanks
Kevin