My keyboard suddenly stopped working (I'm at a different computer now) and I can't figure out why. I checked to make sure the cable didn't come loose and that it was plugged in securely. I looked in Control Panel and my keyboard properties and it seem there's no device listed. I borrowed someone else's keyboard and it does the same thing, so it's not the keyboard. I think it's the port that the keyboard plugs into that's gone bad. How can I fix this? Also, should I buy a keyboard with a usb port instead of the purple plug.