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CPU fan stops when booting into Windows 2000

mollercw
mollercw asked
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Last Modified: 2010-04-13
I have a lab of machines all based on GA-6BA motherboards with Cel466's. I've been having problems with them lately. I opened one up and saw that the CPU fan stops spinning as soon as Windows starts loading (the bit where the desktop colour shows). It's dead until just before the machine shuts down.

Somewhere along the line, a driver or something is stopping the fan. How do I stop this? I installed the Win2K SP2 Rollup package (the pre-SP3 service release) and this didn't solve anything. The INF updates from the Gigabyte site didn't install because "your OS supports all your devices".

Any ideas?
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Commented:
Windows 2000 has Advanced Power Management and on these machines can control the fan.  It thinks, based on the settings, that the fan is not needed since the CPU temp is in range.

Check the power management settings, check the CPU temp range in the BIOS setup, and make it what you need.

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Commented:
Nope, no luck. No temperature settings in the BIOS either. I disabled all power management in the BIOS, and it still does that.

Author

Commented:
Nope, no luck. No temperature settings in the BIOS either. I disabled all power management in the BIOS, and it still does that.
Commented:
Looking at the specs for the mobo, I notice that the board supports "Fan stop during suspend mode".

Bear in mind that disabling APM in the BIOS isn't going to succeed becuase Windows' ACPI features allow it to access (and change) PM BIOS settings itself.

Check the system Event log to see if there are any ACPI entries that mention "illegal bios address".  This is a known problem in XP, since many mobos' BIOS settings are proprietary and XP is therefore unable to properly control what is does to your motherboard...

Sounds nasty, but doesn't usually cause a problem - just error messages in the system log.  Talk to Gigabyte about an updated BIOS, if I were you.

Author

Commented:
I got the latest (beta) BIOS from their site yesterday and updated the last one just 5 minutes ago. They all run fine now. This issue wasn't listed as a bugfix though, so it was a last ditch attempt. Luckily it worked.

Commented:
Glad to hear it ;)

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