My 2006 OPEL ASTRA(1.7CDTi) went off while driven it. When cheecking the bonet, I realized that there is no more water in the radiator and there was no sign of overheating from the dash board. Later I realized that one of the water holes is leaking, which I fixed immediatly. But ever since then my car is not Starting. I even called in my mechanics to look at it but he was unable to start my engine. Please assist me.