wtf? How do you define a "human mind" then? What precisely is a "mind"? How would you recognize a mind if you saw one?
You could crack open my head and see that it's all made of biological parts, if that would satisfy you.
Robots can have minds too, can't they? So in order to establish that there is a mind you would:
1) establish that there is a mind
2) establish that the organism is human
Seems pretty trivial.
Allow me to clarify.
Robots can't have minds, they can only be programmed to do something, albeit very well. This is not the intelligence of the mind. For example, your computer(a machine) displays to you the weather forecasts, the Dow stock exchange, the latest news in the media. However, who reacts to all of the following, it is not your brain or the computer, it is your mind. Your brain is not happy, overjoyed, flustered, angry, disappointed, 'you' are feeling overjoyed. This 'you' is what the mind is.
When I discover that my favourite actor passes away, my brain does not become sad, my brain is merely a transmitter of neurons that indicate to me what I should feel physically and mentally. But who feels? it is the "I" that feels, that responds.
A computer cannot respond to the information it is displaying, it does not have a mind of its own.
I hope I'm making sense here.
How can you know if I have a mind? Well, you can't. That's pecisely the point. My nature is unknowable. You cannot possibly know if I am a human, robot, or alien. You merely assume this, you take it for granted, but can you ever prove it?
No.