new holland tz18da

my tractor will not start it has a new battery fuses are all good safety switches are all ok. i turn the key on the lights all work fuel pump works but I get nothing. what could it be ? ignition switch- starter I have no idea could someone please help?

266hours safety switch on the seat works, safety switch on PTO tested. fuel pump is heard and filled up bowl after changing fuel filter. cranks over but not start. stalled after running for 30 seconds when I pulled it out of the barn. I changed fuelfilters, fuel to filter no problem. I...