keypads shouldn't have an audio port. its most likely the computer/laptop thats beeping, which usually beeps if there is a missing piece of hardware, or driver.(moreso the former). Worst case scenario is a broken keyboard.
when running into keyboard problems, I have only encountered ones where keyboards didnt work during windows installation. If its a usb keyboard, the most i can say is turn on legacy drivers in bios(if you can) or try a different usb port. if its a laptop keyboard, I wouldnt know how i would approach that situation, as I havent personally had experience helping someone or aiding someone with a broken laptop keyboard.