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[Martian]

Double insulated PSU pack, surely, so why the earth  :-/

I have no idea, because as you correctly state it is a double insulated device so there is no need for it (it even says that on the PSU itself).
I think that's what took me so long to track the problem down, the PSU being earthed was the last thing I was thinking of when fault finding the problem.

Since then Toshiba have moved over to smaller PSU's (65W as opposed to 90W) and have also ditched the unnecessary earth connection, although I suspect that is because it's cheaper rather than Toshiba knowing there was an issue that needed addressing.

Having said that, Toshiba's money saving exercise has fixed the problem that everyone with earthed PSU's was getting so it's all good at the end of the day, except the crappy Realtek soundcard of course