Keyboard is defected in my toshiba laptop

[Leonessa Catanaman]

Good day, the keyboard in my toshiba laptop is defected so I am therefore trying to use usb keyboard but it seems connected to the built-in keyboard because it won't function. Like in my keyboard, the key 'I' will function then using usb keyboard only the key 'I' will function also, the same with using on-screen keyboard.

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