I own a Gigabyte X570 AORUS ULTRA (rev. 1.x) with bios version F11 (latest). Sometimes my casefan (sys4) does not start when I turn on my computer, causing the fan alarm to go off. The way I work around this, is to go into the bios and into fan control and temporarily set sys4 fan speed from normal to full. I don't even need to exit or save the bios because as soon as I set to full, the fan starts spinning and I can set it back to normal and from there it keeps spinning on normal mode untill the next time the problem occurs.
Last weeks I kept a log on when this issue occurs:
I already replaced the fan but no difference. It seems the start voltage/current is too low. What should i do to prevent this from happening? Obviously I don't want to set to full constantly because that's way to noisy.