Usb Computer Keyboard Ps\2 Keyboard And Usb Keyboard Not Detected Upon Start Up Of Computer?

Ps\2 keyboard and usb keyboard not detected upon start up of computer? - usb computer keyboard

Ive tried to format my computer or access to the BIOS, but when I am on my computer the keyboard lights flash just does not work, and when the computer starts, the keyboard is not working, what is not?

-Thanks