New Almera Owner saying hi and help!

I've just bought a 2005 Almera Tino. I love it, all good so far except I can't get the satnav working. On start up I get a screen that asks me to press "enter" to confirm that I except responsibility for driving safely, Blah blah etc. And gives the opportunity to select a language and km or miles. Nothing happens when I press enter. I can't get past the start-up screen. There is a map cd in the drive under the passenger seat which I have cleaned and put back. Any ideas what to try next?
 
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