Schritt 4 übersetzen
So take out a flat head screwdriver or some more fancy scraping tool and scrape the dullness out of the contact pads - just do it carefully not to damage the PCB elsewhere. (...and please do not laugh at my "fine" scraping quality :-)
When done with scraping, screw back the PCB to the hard disk body. Chances are it will happily spin up again and the computer's operating system will be able to use it as usual. '"Yoo-hoo, music saved, hurray!" me went at this point!
I hope the luck goddess smiles to you and this ultra low tech repair saves the day for you too! Happy iFixing, mates! :-)