I've got a Gigabyte GA-K8NS Pro motherboard with a AMD Athlon 64 2800 processor. The heatsink fan stops and starts during bootup.

At first I didn't notice the pattern so I got a replacement fan from my supplier because I thought the fan was failing.

The pattern is that the fan starts when I power up the machine. During the BIOS screen the fan shuts down. Finally, just after the the "Windows XP Startup.wav" plays the fan restarts and stays running for the entire time I've got the machine on.

I don't know but perhaps the fan has always done this and I'm just now noticing.

Has anyone ever heard of something like this?

This setup is about a month to a month and a half old.

TIA