One thing that isn't brought up here is if your not using the same keyboard in the same USB port the system has to detect the keyboard as a new hardware device and that could take a full 2+ minutes. The new hardware detection process does not take place until the system has finished it's boot up process up to and including the login prompt and all hardware and startup files in the registry. If you have a USB mouse a good test is plug in both the keyboard and the mouse, insure that your forcing a new hardware detect on both devices, when the mouse starts moving around about 30 seconds after that start testing the keyboard by doing a ctrl, alt +del to get to the login prompt. Now remember a full 2+ minutes not a "it should be done by now" 2 minutes. I usually startup the system go get a cup of coffee or do something else then come back and test it.
