When you bleed the radiator did water come out? If not & if you have a sealed system is the pressure gauge at 1 Bar? Try turning the Radiator valve fully open (anticlockwise ) & on the opposite side there should be a cap that you can't turn, remove this cap & using a small spanner make sure that the valve spindle is fully open (anticlockwise). If still no heat try turning all the remaining radiators off and then put the heating on only.