Your kit should be connected via the USB Port, it should then be recognized as a midi port in Cubase (in no case should you connect using both USB + 5 Pin simultaneously!). You can additionally connect the audio outs of the kit to the computer with audio cables. I haven’t a clue what you mean with a printer cable - I’m assuming you mean a USB cable such as one might use to connect a printer.
You don’t mention what soundcard you’re using. If you mean the one built into the laptop, then I doubt you have a MIDI port. I can’t even imagine how you are connecting the 5-pin MIDI out to the laptop 
Or do you have some other Interface - you don’t say.
Perhaps you could describe your connections and laptop + soundcard in a bit more detail.
Regardless, what I said at the beginning of the post is correct.