Gt Pro Dead , Help

Hi all , first of all thanks for letting me in ! Sadly I’m asking for help .
I went to start my gt pro yesterday and it was dead as a door nail , no screen lights , no priming absolutely nothing apart from the little intermittent led on the dash. Checked all fuses including the main one under the battery and also fitted a brand new battery , still nothing at all . Today I stripped out the ignition and tested and it was fine . Then there is an antenna wire to the ignition that seems fine but I will need to check that with a meter tomorrow if I can get the correct resistance values for it from Triumph. Clutching at straws here people so do any of you guys have any ideas ? Tia sean