The ebay ones are a waste of time, can be known to corrupt drives somehow apparantly theres a file on the hard drive that needs to be copied over which is hidden (ive no idea, i couldnt get the ebay one to work either)
Walked into game, bought a new one, waited, used it, boxed it up and reused the security seal, returned at another store with the excuse my one off ebay turned up which i was waiting for.
Job done, pikey yeah but its a rip off for a cable you only use the once!