Answer:
Am an operator in one f the beverag compay in my country,since step 5 is almost close to fashIon difficult yet an interesting one.we frequently had a problem of malfunctioning between the out put cards as soon as he panel was on the out put cards would not retain it out put voltage and then nothing comes on.
Because of small electrica interest i switch off the electrical panel,remove all output cards and starts inserting then by turn and finally i notice the faulty card.