Too hot temperature of disk - HP Compaq nc6220

[Aleksandra Brzezińska]

Hi,
I have HP Compaq nc6220 PG789EA. I've installed FreeBSD 6.1 (minimal
installation, default kernel) - everything was OK: I upgraded ports,
compiled xorg, fluxbox, firefox, some more programs... Sometimes uptime
was more than 14 hours - no problems.
But yesterday when I read mails fan was stopping (generally it works
very loudly). Nice silence but after some minutes everything was killed,
I can read that disk temperature is too hot and system would be
shoutdown imidiatelly. ( of course it was true: laptop was very hot). 
As I understand it is problem with ACPI ? Can I solve it in any way or I
must give up FreeBSD?

Could you give me any advice? I'm FreeBSD noob and I don't know what
information could be usefull (any logs? - after described situation I
haven't used that system).
I am using linux on the same laptop - without problems.

thanks,
Aleksandra Brzezinska