Thomas de Groot <tho### [at] degrootorg> wrote:
> Normally, the CPU fan of my HP Tower PC just functions pretty 
> noiselessly and only speeds up in exceptional cases. Suddenly, since 
> this morning's start up, it immediately switches to high speed with an 
> increased level of noise as a result.

My previous PC had the problem of a very noisy CPU fan. If room temperature
was anything above chill, it would make the fan go wild.

A technician on a shop suggested I check the computer's BIOS settings.
There was some setting along the lines of "try to keep the CPU always
at a temperature less than X" that was turned off. When I turned it on,
the CPU fan went amazingly quiet. I monitored the CPU temperatures, and
they never went up even when I couldn't even hear the CPU fan almost at
all. Only when the weather was really hot it would speed up.
(My new PC has a similar setting, but it was on from the get-go.)

I don't know, however, if this would be the the case in your situation,
especially given that it just happened suddenly, after having worked ok
in the past.

I don't know if, for instance, some Windows update or something like that
could mess up with the BIOS or other hardware settings. (Was there
something like a system update, or something similar, just previous to
the appearance of the problem?)

But check your BIOS settings just in case. There might also be a similar
setting somewhere in your OS (especially if some hardware control software
was installed alongside your motherboard/cpu.)

-- 
                                                          - Warp

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