vs commodre problem

[JOSHYcommodore]

so i parked my car for a few months..
when i left it there it was running perfect..
i then went back to it and it wasnt firing at all had petrol and everything.
someone said buy a new ecu so i did still nothing changed,so then i keep exploring.
ummm there was no pulse on my one injector..
then a went back a week ago now no engine cranking at all no nothing no noise batterys fine i had a brand new starter mottor put in last yr so i doutb its that im so confused might sell it for a ford soon jks.
but HELP ME PLEASE.. I WANT IT GOING SO BAD IM SO DEPRESSED ABOUT IT

[vsl67]

check all of the relays and the engine fuse in the engine bay and also check the battery earth cable to begin with ,then check your key head is working and the factory emobliser is turning off when you try and start it finally check the neutral safety switch in the shifter is working