Landing in conditions of zero visibility requires an autoland, using the autopilots.
If the autopilot(s) fail during such an approach then a go around is required and the pilot will select an approach/airfield that is compatible with his serviceable equipment.
As aircraft often have up to three autopilots fitted and a variety of back-up systems the appropriate procedure will vary according to different aircraft/companies/the point in the approach at which the failure occurred etc.
Hope that helps.