I am working on a project where I shot the original files in .mp4, then converted to Apple ProRes 422 in Compressor. When I brought the files into Final Cut and put them in the timeline, the audio would not play. Instead, there is a red bar on the very top of the timeline, and the only audio is a repeating beeping. I am new to Final Cut (obviously), what can I do? Thanks.

you just need to hit render all. it happens when your sequence settings are different from the file you dropped in there.

Nick,
I tried that out and it worked just fine. Thanks for the help, it is greatly appreciated!