ECM/ECU replacement

I have a 09 polaris touring 500 efi , I cant access the diagnostic mode and the machine does nothing when you turn the key, the fuel pump doesn’t engage and no clicks . The main instrument cluster does come on but that’s all. Before parking in garage I did have trouble starting but eventually ran fine and backed into the garage. My question is does it sound like the ECU need replaced?
Thanks for any Help.