3 Replies Latest reply on Jun 1, 2012 1:18 PM by Brian Wharry

    DZ77BH-55K - Fans at 100% with BIOS v70




      today I upgraded to BIOS v70 and found that both CPU and case fan run at 100%,

      regardless of the fan control settings in the BIOS. I tried both automatic and manual

      settings, and loaded BIOS defaults without any effect. Fan control used to work

      with the original BIOS version.


      Any ideas on this?


      Thank you


        • 1. Re: DZ77BH-55K - Fans at 100% with BIOS v70



          I had the exact same issue.  I went into the classic mode BIOS and under the Fan settingsreset defaults and rebooted and fan speeds are working normally.  You can get to Classic mode from the home page of the Visual BIOS and use the option in the top left hand corner.





          • 2. Re: DZ77BH-55K - Fans at 100% with BIOS v70

            Thank you Phil, the classic mode worked for me, too!


            (Side note: I had to go back to BIOS defaults via F9. Restoring the fan settings alone was not enough in my case.)




            • 3. Re: DZ77BH-55K - Fans at 100% with BIOS v70
              Brian Wharry

              I know you guys solved your problems, but I'm replying in case anyone else is having the same problem and your steps didn't work.


              I had the same fan problem with this motherboard, but simply selecting the default fan controls didn't solve it for me.


              When I first got the mobo, I flashed it to the latest bios (0070), and everything seemed fine except my CPU fan was always running at 100% and Intel Desktop Utilities (IDU) had a constant blue spinning wheel.  Repeated reinstalls of IDU didn't fix anything.  I never downgraded the BIOS, I simply performed the following steps:


              1) Boot into the BIOS and immediately go into Classic mode if not already there.  I think the Visual BIOS was introduced with 0070, so if you have an older BIOS you may already be in Classic mode (the DOS-like looking blue background screens).

              2) Load the BIOS defaults.

              3) Without rebooting, go to the fan control section and select the option to restore default fan options.

              4) At this point I believe I saved my changes but did not reboot.  I then proceeded to manually change every option as needed (e.g., turning on RAID support, disabling onboard video, etc.).

              5) Save and exit BIOS.  With any luck, everything should start working normally.  I could tell it worked because my CPU fan didn't speed up and IDU finally worked.


              I should note that I had previously tried the Load BIOS Defaults option without also doing the fan control defaults, but it didn't work.  Only the steps above worked for me.