Help! External HD not mounting.

[stifenhowk]

Been using an Iomega 750g minimax HD for back up of photo's, music etc for an old Macbook laptop running OSX 10.4.11 but all of a sudden, it's decided not to mount on the desktop. I think it's just short of 2 years old and wouldn't expect a drive failure at that age. It's making some sort of disk noise, a bit like a stuck record, if that's any help.

The last time it did it, i ran some software called diskwarrior, which seemed to do the trick (it did a rebuild or something like that) but it's not detecting the drive now, so i'm stuck for ideas as what to do next?

Anyone?