what is my mother board

[yojjjjd]

how do I find what is the part number of my mother board it is a custom built Toshiba A500 PSAT9U-0HQ007 (ES5.0) laptop and looked the whole board over and can't find anything on it

 

[Barty1884]

A custom-built laptop?

With that number, this is the motherboard would be here:
http://www.sparepartswarehouse.com/Toshiba,Laptop,Part,V000198160.aspx