microphone works for 1 second before cutting off

hi all using my new laptop a hp windows 11 running an AMD processor.  the microphone is not working, when you choose to switch microphone and test the microphone it will work for 1 second before cutting out. 

it seems to be a zoom specific problem. it also seems to be AMD specific as I have done some troubleshooting myself online.

I have uninstalled zoom and downloaded the latest version, restarted the computer but nothing seems to work. this problem arose after plugging in headphones to the computer and it was working fine before that. I don't think this is the cause of the problem as it is zoom specific but i said it was best to add all information.

any help would be greatly appreciated.

thanks, 

Kerry.