CPU Fan always running at top speed

TomTomazack wrote: As far as I can see on the asrock product page for this mb, your board supports CPU Quiet fan. So as long as you have a 4 pin connector on your cooler, you should be good to go. Have you tried resetting cmos or updating the bios? If those things don't work, I'd start looking for a replacement board, it seems like some controller is broken on it in that case.

Hi Tom, thanks for your answer and help.

Yes, I have a 4-pin connector on the fan. I also bought a new fan with no success. Yes, I have reset the CMOS and I changed the battery. As I mention on my first post, I updated the BIOS first to version 1.5 and then to beta version 1.7.

I also thought the board could be faulty, but I have 2 PCs with the same identical board and both of them have the same full-speed-fan problem. It's frustrating.

bjlockie wrote: You could update to the beta BIOS but there is no changelist in the archive. It may fix the fan problem or it may brick things. You do have a recent CPU for that BIOS. The beta BIOS is from 2018 which is 3 years after the last non beta BIOS. :-)

Hi bjlockie:

Yes, I had already updated to the latest Beta BIOS, as mentioned on my first post. The version is Beta 1.70, date 2018/5/30. I performed this update on both PCs (no success). The processor on both machines is Intel Pentium G3220.

Thank you.