Monitor port not working. Have a Dell Optiplex GX-150 with a foxconn .1160 fixed monitor port on

Question

Have a Dell Optiplex GX-150 with a foxconn .1160 fixed monitor port on the motherboard, can't get any display whatsoever, monitor claims to receive no signal. Have tried to put in other cards for monitor in slots but still no success, any help would be greatly appreciated.i have a motherboard can not get a signel can you help can not get to work on eney monitor