My brand new Biostar TA990FXE motherboard has onboard LED indicators to show different phases of the CPU. One or two of these lights flicker constantly, producing a buzzing noise. This noise can be heard over my speakers and microphone (a person listening to my open mic reports increasing volume of the buzzing the longer the mic is open). I wish to turn off these lights or do something to prevent the buzzing from being transferred onto my audio devices.
See if you can adjust power settings, including Cool&Quiet, to be a little less aggressive with power saving and/or monitoring.
Your board apparently can't make up its mind how much power your CPU needs, and the rapid cycling of power phases is causing your interference.
Edit: And, what PSU (brand and model, not just wattage) do you have? Your board may also be trying to compensate for an unstable power source.
There are many things that can cause 'buzzing' as such, and most of the time the root cause is a cheap or bad PSU.
If you have Utilities like Green Power II Utility installed then Uninstall. Otherwise, I see no way to control anything but the GPU Phases.
This is a LOAD issue, i.e. 9/10 a PSU issue, and as the load changes you're hearing the 'buzzing' noise. I assume the PSU is plugged into a 3-prong GROUNDED outlet; try a different outlet. Sometimes the electricians flip the phases in the sockets.
All utilities that came with the Motherboard have been uninstalled (except the motherboard driver, of course). BIOS has been returned to its original settings (after lowering the CPU fan performance AND unplugging the fan altogether), but despite any efforts the problem persists.
Moving fan to a different header did not work.
BIOS cannot calibrate the fan for some reason. Nonetheless, I put "aggressive" as the CPU fan behavior.
Please keep in mind that the buzzing is present even without the fan altogether.
i plugged my smaller headset into the front and back audio jacks, and the back jack has much quieter buzzing (still buzzing, but negligible).
Lemmie switch the AC '97 with the HD Audio and see what happens.
Lazy solution: The speakers' volume needs to be turned up significantly for the buzzing to be detectable. During normal operation, no interference is noticeable. As long as some sound plays through the speakers, the sound will mute the buzzing.
Regardless, when no sound is playing, the buzzing is still irritating (and it shouldn't be present in the first place anyways). But...I got some kind of backup...
I did everything you told me. Nothing changed. One interesting thing though: I tried connecting the HD Audio input into the motherboard from my old case and to my surprise the audio interference was much much lesser (when heard over the audio jack from the old case). How could my new case be providing me clearer interference than my old case?
My old case is http://www.newegg.com/Product/Product.aspx?Item=N82E168...