Desktop or laptop ? If custom desktop, open case after unplugging power, get a flashlight and try to find the motherboard markings and write it all down. It's not the FCC number.
Then you know which website to go to, failure on that, try aida32, freeware. It will identify hardware on your system if you are running a basic install.
Laptops should be written on the bottom of the case, carved or on a sticker.