How do I get mobo drivers when all I have is the serial number?
Don't know the manufacturer.
Any One ?

Motherboard drivers can be found on the motherboard manufacturer's website. How do you find out who the manufacuter is? Either by examining the mb itself or by noting the long bios string id that appears on your monitor screen during bootup (lower left). Use the PAUSE key to freeze screen so you can write it down. Repost with bios string and someone will be able to help you.
It's ok to ask how to find the model of your motherboard in this support forum but when asking for drivers, please post your driver request in the Drivers Section.

also, http://wimsbios.com is a helpful website in id'ing your motherboard.