zafira c wont start. Help me please

[djfrig]

I have a 2015 vauxhall zafira c.

So a few weeks back, I started the engine, it was idling as it shouid, then about 30 seconds later the engine stopped.

When I turn the key it goes to turn the engine (you can hear it trying to turn) and it stops turning and u hear a whirling noise. 

I hooked it upto the diagnostic machine but there is no trouble codes showing up.

I tried cleaning the battery terminals but that did not fix it.

I got a new battery but that did not fix it. 

So I bought a new starter but that did not fix it either. 

Does anyone know what else it could be??