Okay a few points re the above.
I connected the USB to the PC. It searched for a driver and couldn't find one asking me then to insert a driver disk which I don't have.
I aborted that then opened Windows Explorer which showed it as two removeable drives E: and F: but trying to access either said "device not ready"
Before I packed it up to send it back, I found by a google search if you press volume up, volume down and power on together, you should get a menu that includes restore to factory settings. I didn't. After the initial android boot up screen, it went to a picure of an android laying on it's back, with it's front open and a big red exclamation mark. I was told that means it's trying to install software that has failed.
so it looks like something has got corrupted?
As for the usb is the hdmi out. Well that's not just a simple cable is it then? surely it's an hdmi video driver with a USB connection, no doubt not a cheap device.
And yes I'll take any advice on setting it up. I want it so there's a good selection of kids games, and so that it's not possible for the kid to brick it by pressing the wrong thing.