Hardware Secrets published a beginner's guide on finding out your motherboard's brand and model, you can read it over here.
Learn how to find out your motherboard’s manufacturer and model, required information if you want to download a new BIOS, drivers, and manual for it.
Here is a snippet:
"Sooner or later you will need to know the manufacturer and exact model of your motherboard, especially if you plan to upgrade your computer, since the upgrade capabilities of your computer are set by the motherboard model you have. You will require this information if you perform a BIOS upgrade or download your motherboard manual or drivers. A BIOS upgrade is needed to make your computer recognize a new CPU, and the manual is necessary if you want to check how much RAM your computer is able to recognize or which CPUs it supports, for example."