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CPU fan acts strange after I 'save & exit' bios...please read.

M

moocat

Platinum Member

The motherboard is a Gigabyte 6vx7-4x (not sure of current bios ver.). I have the cpu fan plugged into a fan header and when I come out of bios the fan stops and starts, or slows down temporarily. I don't know the brand of fan but it's the stock one that comes on the K600 socket370 cooler and I've used it many times before (Datec I think). I'm sure it is not even close to drawing too much current for the header. I tried another fan and it did the same thing. I also tried 2 different fan headers..same problem occured. I also noticed that the fan speed doesn't show up in bios.

If this is just a quirk with the system I can live with it, but since I haven't encountered it before I was a little worried.

Anyone else ever see a problem like this?

 
You may have changed a power management setting. I had the same thing happen to me about six months ago. Turn power management off in BIOS and see if that makes a difference
 
It's the system resetting itself. You should also see the same thing happen when you use 'Restart' from the Windows shutdown menu. The system powers down, but not totally. So the fan slows down but may not actually come to a stop before the motherboard powers back up.

Same thing happened with my EPoX MVP3G-5. I thought it was pretty cool.
 
The first time it happened the fan would spin and stop, spin, slow down, spin up, stop...randomly. This was happening while windows was up. It kept doing it until I finally shut the computer down. I thought for sure that the fan was shot but that is not the case. That is not just a reset issue.

Thanks for the feedback on this. Anyone else wanna take a whack at this problem?
 
This doesn't answer your question as to why the fan does strange things, but just connect it to a regular 12v PS connection. The yellow fan wire should be the rpm monitoring wire and still be connected the fan header. I just have a 'thing' about not using fan headers. The voltage never seems to be full 12v, they are susceptable to blowing out.
 
I typically don't use them either, but this little fan just didn't seem to pose a threat. I think the current draw is under 200mA. I did make myself an adapter so if it acts up again it I'll take it off the header.

Still would like to know why it's only effected by bios edits.
 
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