How To Find Motherboard Serial Number

[Sghosh]

I have lost my bill and I want to know that how to find motherboard serial number, (Like ASUS motherboard, Gigabyte motherboard, MSI Motherboard) If any body know then suggest me.

 

[Onus]

It may be on a sticker located on top of the rear I/O ports, or other smooth flat surface on the board.