i1200 Thinkpad fan problems

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Anyone ever experience this? Fan spins up at startup and shuts down the
second Windows starts up.
It will never run again till windows shuts down and then only for a few
seconds. For the record, fan will spin
continuously when you are in BIOS and even spins full time when you go into
the battery conditioning mode.
All this leads me to believe it's a Windows problem and not the actual
laptop. Of course I could be wrong.
Running Windows XP SP2 with ACPI.

Many thanks

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