How can I find out what motherboard is in my computer?

Daveb was moving in the right direction. You need to type the following within a command prompt:

wmic baseboard get product,Manufacturer,version,serialnumber

This will provide you with the maker of the motherboard, model number, and serial number.

Yet another option to launch dxdiag tool from the start menu:

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CPU-Z can identifiy mainboards, among other components. I think that should do it.

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