is my CPU fan slowing ramdomly?

Well I just installed Windows 7 this morning and I'm loving it, I tweaked and fixed everything very neat and my machine is working great and all;
but still there is this small detail that seems kind of weird, lets say I turn on my PC and surf the internet for a few minutes, may be half an hour,
then all of the sudden I hear this 'click' sound that my PC does when I shut it down followed by the sound of a fan shutting down,
except that it doesn't actually shut down, I keep using messenger, playing music or other stuff.
I even looked inside the Case at the CPU fan, the little fan in my Graphics card, the power supply fan, all the fans seem to be working.
And also, if I then do something like start a download, or play a movie, the PC does the opposite, like if it was being awaken all of the sudden.
So it makes me think that maybe it is a feature in windows that is lowing the CPU fan or putting to sleep my HDDs,
I tried investigating but so far no luck; hope someone can shed some light, thank you.

btw my System is something like this:

-Intel Core2 4400 @ 2.00 GHz 1.00 GHz
-2.00GB RAM
-Windows 7 32-bit
-OS HDD 80GB + 320GB, 40GB HDDs
-ATI RADEON 2400HD
-Riviera Sound Card

*it came with two extra fans for the case that I removed a few weeks ago when the weather was a bit cold (because of the noise)

UPDATE: ok I just stumbled upon this interesting info and I came and wrote it in here,
but the page crashed so now I don't want to write it again so here I leave the screenshot of it:

http://img534.imageshack.us/img534/3142/screenyu.jpg

Could this have something to do with it?,
the LCD display in front of my Case says CPU @ 21.1°C, but it could be wrong I guess.
The most it will go is like 28°C I think, when the weather is really hot.

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Does your BIOS has EIST enabled?

hmm could be it needs a good cleaning i`d try either a box of air or a an aircompressor like i do lol. carefully ofcourse, but it does wonders :yup: or it could be an BIOS thing like cabalo mentioned.

Quote:

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Originally Posted by Cabalo

Does your BIOS has EIST enabled?

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I went to the BIOS and couldn't find that option,
among other things I found this, but some google-ing tells me not much is useful after all, anyway:

under Power Mngmt. Setup
-ACPI: Enabled
-Power Management Option: User Defined (other options are min saving & max saving)
-HDD Power Down: Disabled
-Suspend Mode: Disabled
.....some stuff about graphics,
-HPET Support: Enabled
-HPET Mode: 32-bit
-WDRT Support: Enabled
-WDRT Run-Stop: Stop
-WDRT Count: 1023

under PC Health
-Shutdown Temp: 85°C
-CPU Fan Control: Always On
-CPU Fan Load: 5
-CPU Fan Start: 38°C
-CPU Fan Full Speed: 80°C
-Start PWM Value (%): 30
---finally I might add that BIOS listed the CPU @ 31°C
when the Case display says 21°C, now I know better.

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I'll bet it's your hard drives spinning up/cutting out.
Go to Power Options and check if the drives are set to cut off after a period of time.

Quote:

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Originally Posted by clocker

I'll bet it's your hard drives spinning up/cutting out.
Go to Power Options and check if the drives are set to cut off after a period of time.

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I believe you might be right, took this screen just now,

http://img404.imageshack.us/img404/35/35884445.jpg

although that still leaves the 'fan-like' sound, I find it hard to believe that the HDs are making all that noise after all.
still I guess it will turn out to be somthing to do with Power Management, as long as it doesn't harm my Setup it's ok with me,
I'm all good with $aving electricity. :P

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Quote:

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Originally Posted by worldpease

Quote:

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Originally Posted by clocker

I'll bet it's your hard drives spinning up/cutting out.
Go to Power Options and check if the drives are set to cut off after a period of time.

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I believe you might be right, took this screen just now,

http://img404.imageshack.us/img404/35/35884445.jpg

although that still leaves the 'fan-like' sound, I find it hard to believe that the HDs are making all that noise after all.
still I guess it will turn out to be somthing to do with Power Management, as long as it doesn't harm my Setup it's ok with me,
I'm all good with $aving electricity. :P

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If it really started after you installed windows 7 then it's 98% chance that it's just a power management setting and not a hardware problem.
I agree with clocker that what you're hearing is just teh hard drive. Try setting that to 1 minute, then leave your computer for a minute and you should hear the click sound, open a program and you will hear it start up again.