ok so heres the deal i start a new job on monday and my car isnt starting!!

i think its my mani relay. i started the cat this morning drove to my dads and started to wire up some speakers. after i was done. i went inside came out and car wouldnt start. i pulled the radio out thinking it might have been something to do with it but nothing. the car turns overs but is getting no fuel or spark. i checked the fuses and there good. but im not hereing the main relay click. i lloked under the hood. and there was a fuse blown it was a 7.5amp and it said it was listed under backup. next to the ecu fuse. i replaced and still nothing. when i turn the key. the engine light comes on and stays on. never goes off until i take the key out. please help. i need this job

 

check your main relay

 

if its not the relay what else could it be