Remove Authorisation from dead PC

Hi my PC has died (motherboard dead) and i will be rebuilding. I have contacted InMusic support but no answer after a week. How can i remotely remove authorisation from my old PC?

I think you should just be able to do it via the LM when you reinstall on your new computer.
Just choose, 'delete, or remove authorisations.

Unless you used all 3 of your authorisations you should be fine and then hopefully soon somneone will refresh your licences for you.