HD not recognised - urgent action needed

Two days ago, my main Maxtor 80GB hard drive (with virtually all my stuff on, and only about half of it backed up) started making a clicking noise and freezing Windows. I got a fix tool from Maxtor which fixed the problem, leaving seemingly everything intact. And now tonight, it happened again. And the drive won't recognise at all. I can't boot to it and I'm scared to touch it. I have another 80gig hard drive in my PC as well (that's actually the same model but older, and it hasn't had a single fault) that I could make a temporary setup on, if I need to. Is there anything I can do to get this drive back - like Drive Rescue? (please say yes, please say yes... )

 

The answer? Completely the opposite

We have good news. Very good news.

The problem (all along, it seemed) was a dodgy power connector. And it's the connector itself, not the HD side of things. But I've got no spare ones, so a new PSU is the long term solution (if I ever need both HDs at once).

Life is good,