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Panic! The old back-up Hard Disk refuses to mount! The operating system does not "see" it at all and it does not make the happy spin-up noise! What could have happened? You just used it for a succesful back-up last month and stored it again in its quiet sleeping drawer! Why doesn't it wake up?
Before you start going through HD cradles in frenzy or just give up thinking "doh! there goes my rare music pieces collection" (at least like I did) do have a closer look on the logic board. Any bare metal point not shining in the light as it should? A-ha! The red circles here denote what I saw when I exclaimed this.