I forgot to ask I assume you are getting lights behind the back glass?

also try turning the machine on then off then on quickly (only once) in case the machine has gone to default settings and the displays are not working.
if this is the case when you have turned the machine off then on again the insert lights on the playfield will do their attract mode dance but you will not be able to start the game until you put some credits up by activating the coin switch and then pressing the start button