Question about Intel Motherboard
When I start the computer everything starts up all fans the hd the disk drive ect.
The cpu fan only starts up when it is another slot the sys_fan in this case the weird thing is the cpu_fan slot has 4 pins and the sys_fan slot only has three.
I have resetted the video card, memory, cpu fan etc.
I have taken out the bios battery waited and then put back in.
I've tried everything else have been able to find on the internet short of putting a jumper on the cpu_fan slot because someone said the mobo wouldn't start up if nothing was plugged into that slot. I didn't try it because i do not have a jumper.
I'm really out of ideas other than taking it into a shop.
Any help would be greatly appreciated thank you.
The four-pin CPU fan connector is the same as the three-pin (red is for voltage, black is ground and yellow for the rpm reading) but also adds a blue wire used by some BIOS sets to adjust the RPM speed of the fan. The three-pin will fit into a four-pin connector without modification, using a jumper is DEFINITELY not recommended as it could short your board.
If your system has the four-pin fan, and it boots and runs without error, it may be that your CPU is running cool enough that the fan is not needed at the time. Check your BIOS for a hardware monitor to see the actual CPU temperature. Also, you may have added utilities in Windows to give the fan speed and CPU temperature in real time. You may also notice the CPU fan kicking in when doing CPU intensive operations (virus scans, etc.)
The four-pin fan would run from a three-pin connector but would always run at full speed because the RPM Adjust signal is not present.
Posted on Dec 28, 2008
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Posted on Jan 02, 2017
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