But we have designed computers to send emails and watch porn, not replicate consciousness. Of course your dell is not 'conscious'.
Consciousness is a self awareness and awareness of beyond the self.
We could build a computer and give it input and ouput, such as cameras for visual input and speakers, robotic limbs for output. We could program it to process all the input, we could program it to mimic, we could program it for reward and punishments, just as we do with hormones, with reward being offered for,behaviour that promotes survival and punishment for anti social behaviour. We could program it to seek patterns and we could program it to seek acceptance from peers, which it could learn from facial expressions etc, etc, etc, etc, etc......
Once we turned it on..... it would function as we would.
To be conscious is to be nothing more than switched on, to be functioning.
What exactly would be missing from such a computer, that you would call consciousness?
We are nothing more than that computer as far as I can see. There is nothing missing between the hardware and software and to what you call consciousness.