1 RADIATOR REMAINS COLD?

MY HUSBAND PUT A SHELF UP AND PUT A SCREW THROUGH THE CENTRAL HEATING PIPE, WE HAVE A COMBI BOILER, HE REPAIRED THE PIPE, GOT THE HEATER UP AND RUNNING, BUT UNFORTUNATELY 1 OF THE RADIATORS WILL NOT WARM UP - PLEASE CAN YOU HELP, MY HUSBAND HAS BLEED HER THE RADIATORS AND THEY ARE ALL HOT ACCEPT FOR 1 ?