I've spent the better part of the past week trying to get to just this point.
I'm sad to say that my Nikon Coolscan 5000 has bit the dust (I suspect that a capacitor failed on the main PCB and am looking into repair options).
On the bright side, I have finally been able to get my Epson v700 to work, but it's very slow going, having to manually scan each frame, a process that will begin tonight.