All OK now. I tried all the holding the home key down but that didn't work. I disconnected the battery and that worked. I did get some error messages but they have now cleared on their own and car running fine. It seems there is some kind of glitch with the infotainment screen as that runs everything and with no screen you cant do much. All ok now so hope it was just a one off.
The ZS EV Gen1 has performed the "Black Screen Of Death" ? for many owners, from when the car was first released.
I varies from a brief black out of the screen and it self correcting itself, or getting the black screen and it never returning ( until rebooting the car again ).
Or getting the black screen and losing the audio from the radio or the Sat Nav !.
It can be sometimes be resolved, by holding down the centre button on the head unit, but you have to hold it down for about 30 seconds.
If this fails, sometimes it will recover by simply shutting down the car, a brief wait and then rebooting back up again.
If this fails, then remove the negative battery terminal from the 12 battery for a few minutes and then reconnect it back up.
Most ZS EV drivers carry a 10mm spanner with them ( ask me how I know ).
There was a software update released for the info unit for the ZS EV Gen1 model.
I am not sure if this has been done for the other models as of yet ?.