Or the old style trick, if you have long arms
hold the key in the start postion, and have a suitable clonking stick,aka long metal bar/starting handle handy, give the solenoid on top of the starter a few clonks, and see if that works, if it turns over, suspect starter needs looking at,i have done that a few times with some of my Fulvias in the past, i still have the Aprilia starting handle used in the garage,
good luck