Strange Motherboard Behaviour

I recently upgraded my motherboard to a Msi Z87-G45 and have been noticing some strange behavior when the computer is shutting down. Just before the computer shutsdown all the USB devices such as keyboard and mouse will flash on for a fraction of a second, one or twice and in addition to this my speakers will make a pop sound around the same time.

Is this what I should expect when I shutdown with this motherboard, or could I have a defective Motherboard.

Any help would be much appreciatedĀ 


Its fine dont worry.

Hey thanks, you've put my mind as ease!