A105-s4254 Motherboard Motherboard Question: How Do I Find Out What Kind Of Mobo I Have? Toshiba Satellite A105-S4254?

Motherboard Question: how do I find out what kind of Mobo I have? Toshiba Satellite A105-S4254? - a105-s4254 motherboard

The model is a Toshiba Satellite A105-S4254. The motherboard must be replaced, but I'm not sure eBay is correct. You can not use a program because it is not easy. I do not know where the book apart. Is there something similar to what is essential to find RAM, but for motherboards? Thank you for your intelligent responses.