No Power To A New Unit
Once your new unit has stood for 48 hrs http://www.eurocave.co.uk/servicing-cab-why-wait-48hrs, you should put the wine in, then switch it on. Do not load an empty unit with it switched on.
Press the power button on the control panel for the count of 5. The power button is either a circle with a vertical line in it (Classic, Compact, PURE, Collection), or the letter U (Premiere). For premiere models, once the power has come on, do not, press, touch or change anything else for 20 minutes.
If this does not work, check the unit has power to the socket, and that the cable is pushed into the unit itself. The power cable has a plug at both ends, like some kettles or computers.