When installing an HP 6P locally using the setup.exe on disk 1, you get an error message saying that bidirectional communication is not enabled. The printer had previously been setup as a network printer. It has been tested on several machines and the same error occurs. There are several possible causes listed including no toner, no paper, and a non-bidirectional cable being used. None of these is the cause of this error. The same error occurs whether you are logged into an NT network or using it as a standalone. What is the cause of this error?