Let me put your right - the mobo is not really buggy at all.
🙂The fact that some folks have had issues with set up is more often than not down to the user and not the motherboard.
However in your case I would say that you have a hardware issue. And that it is not user error.
🙂OK please do the following for me.
Remove your motherboard from the case. Use the box that your motherboard came in as a non-conductive test bench.
Fit your normal stuff and please make sure that you have none of the components connected or still fitted to the case. I have seen some folks leave the PSU in the case which defeats the purpose of what we are trying to do.
Now power up and see if the hiss is still present.
I assume that you have done the basic stuff like reinstalled drivers and maybe even a new OS install?
To help us help you - please provide as much information about your system and the problem as possible.