If its second hand, it could be good to take it in as a precaution.
<------- Di Bartoli is a good place to start. Renzo will be able to let you know what else needs attention to, if there is anything (scale in the boiler, group seals etc, etc)
How long did you have it on with no water in the tank? And how long until you hit the brew switch.
The other thing is, maybe the whole system was empty of water and it needed priming. So basically the pump was pumping air into air.
Its a great little machine and is capable of great coffee (with a few little tweaks here and there).
Keep us posted! And welcome!!