The wave doesn’t appear in the audacity window so editing is impossible. Any ideas? Mic seems to be working as I can hear sound when the mic is scratched.
Without more information it could be anything.
Please see here: https://forum.audacityteam.org/t/how-to-post-a-question-on-the-forum/23175/1
Also try reading this http://manual.audacityteam.org/man/FAQ:Recording#flatline .