That sounds typical for a bad solenoid of the starter which doesn't release the magnetic pulley holder, try to knock onto the starter will starting when it runs then have the starter overhouled. As far as I know it's from Bosch and can be repaired at every Bosch dealership.

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RaymondQV
Countach QV Ex-Mimran #GLA12997, Urraco P300 #20530 sold in August 2008, Jalpa #FLA12203 sold in May 2006
www.countach.ch
www.jalpa.ch

When Frank Sinatra got his Miura S in 1970, he said: “If you wanna be someone, buy Ferrari - If you are someone, you own a Lamborghini”.