It also whines when its on, but that doesn't bother me, it's pretty quiet when the fans are on, but at night it gets annoying. I tried going into the BIOS, didn't change anything in power management, mobo is a few years old and might not have the features newer ones have(?). The PSU doesn't whine when in the BIOS except when I get to the screen with the time and date on it, the PSU will whine, but when I scroll down until the time/date is off the screen the PSU stops whining, same if I leave that screen and return to the main menu. Any idea what's going on?