Mitac 8375 / Novatech NNB-061 laptop / notebook - can I force fan on all the time?

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Recently, my 30 month old Novatech branded Mitac 8375 laptop has started
just turning itself off without warning.
I thought it might have been heat at first, but then BIOS settings suggest
that it should shut down, not just turn off without warning (as if the
battery had totally died).
As the whole gets incredibly hot anyway, I've always been on the lookout for
something for force the fan on all the time, and have tried various things
like speedfan, but nothing seems to like the Insyde BIOS. Here are the
machine specs:

I've opened the whole thing up, checked for dust and loose connections, and
run it on battery/mains+battery/mains only (battery out) and the same
Also checked power switch and tried with CDROM and

Have run Memtestx86 and RAM checks out OK, so I don't think it's that
either. So, does anyone know a way of forcing the fans on for this laptop?

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