Mazda 3 2010 1.6 diesel...

Bought car 2 days ago, drove back home for a few hours absolutely fine with numerous stops on the way. However woke up the next day and the car ran for about 5 seconds before cutting out. Now engine is just constantly turning over trying to start?

Not a battery issue I don't think as all electronics are working perfectly? Anything easy I can look for?

Thank you!

 

How much fuel is in it?

Have you had it scanned for fault codes?