Let's try this route, when you hit a key on the keyboard does it show up on the piano keys at top of screen? If so MIDI is coming in and the problem lies in your VSTi setup. If not MIDI is not getting in.

Is there a VSTi synth in the default slot at all? If not, try putting one there and see if you hear anything then.

I do not work here, but the benefits are still awesome
Make your sound your own!