Normalising tracks in 2.0.5, recorded in earlier versions

I ripped all my vinyl some years ago using audacity 1.2.4 (or an earlier version) but unfortunately did not normalize the projects or export them at the time. I am now trying to normalise the tracks, opening the projects in Audacity version 2.0.5. However, whenever I now try and normalize (or remove noise), Audacity removes all the sound from the project, giving me a flat line, with no audio, even if I first select a get noise profile. What am I doing wrong?? (I’m quite new to audacity!) thanks

We should get the obvious out of the way first. They do open and play, right? Can you export as WAV (Microsoft)? That’s the desperation method if nothing else works. Koz