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Cheers, I think it's probably the later, as the original computer now has a new boot drive and OS installed, and it's given the same result on two other machines. I've ordered a SATA to USB adapter to try just in case but beyond that it sounds like my best bet is just going to be re-making my portfolio, which was the only thing I really cared about on there. It was all re-works of images I have elsewhere so perfectly do-able if a little bit galling.
If it's recognised by the BIOS, and by the OS, even if fleetingly, I reckon you're mostly ok.
Connecting it into a different machine, or using a LiveCD, means that you current OS is not trying to do anything fucky with a drive that it thinks should be doing something else - Who knows what it has configured to save / read there.
It could be a power problem on the drive PCB, which would mean a donor drive being needed, and that's a new level of expense and ballache, as you need one that is closely matched not just in model but also serial.