Hello and welcome to Apple Support Communities, Tamyjane.
If I understand your post correctly, you are unable to record audio with QuickTime Player on your Mac. I'd like to help.
Let's do some testing to narrow down the issue.
Safe mode will tell us if the issue is related to a startup item or plugins, and sometimes corrects the issue. This article will tell you how: How to use safe mode on your Mac
If everything is working correctly in safe mode, but is not working when you get back to your user account, please check the section titled "If the issue doesn't continue in safe mode" for the next troubleshooting steps.
If the issue continues while in safe mode, a test user will let us know if the issue is isolated to your account, or system wide: How to test an issue in another user account on your Mac. If the issue happens in the test user also, then please check the section titled "If the issue happens in the other account."
Thanks for using the Apple Support Communities. Take care.