I only asked to get you to tell us if the belt was broken, and you said no. That doesn't mean it didn't somehow jump timing causing a no start condition. For that you will need to see if the pump is in time when the crank is at TDC>
Fuel has to be there, so check to make sure the injection pump is getting voltage. If the injection pump is not energized it will not start up. I would check the connection of the pump to the harness. Disconnect and reconnect the plug. Is it possible you lost fuel prime somehow? Make sure you can see fuel spiting out of the injectors when cranking.
As
@oilhammer has said,, it's not the alternator causing the no start.