Have all the cables been good quality data cables, or only the first one (cables do sometimes go bad)? Do you happen to have an unused Kobo cable lying about anywhere that you can try?
Some connection problems have been solved by connecting through a hub, though I'm not convinced this one will it's worth throwing in there.
Is the Kobo's firmware as fully updated as it will go? Being such a venerable device I'm not sure which firmware version that will be.
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