Have you checked that you are running the latest 645Z firmware? If not, update if necessary and see if that fixes the issue. If it doesn't, or you're already running the latest firmware, have you tried activating Live View with a lens not mounted? I'm not clear from your description if you tried this. Look inside, do you see the mirror flip up and shutter open? If so, it's a sensor or electronics problem. If not, it's a mechanical problem that you should see with the mirror and/or shutter. Either way it will have to go in for service, but at least you'll have some idea of what to tell them needs fixing. I've found with Pentax service that it's good to be quite specific.
Also, if it goes in for service and has to be sent to Japan, I suspect you'd be extremely lucky to have it back in 10 - 14 days. The shortest service I've ever had on my Pentax digital 645 gear was 8 weeks (even for a relatively trivial issue, a broken cable release socket), while the longest was 22 weeks (for a shutter & mirror assembly replacement). So if you need to send it in, make plans in your shooting schedule to be without the camera potentially for a long time.
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