HI amber_may,
Welcome to the HP forum!
Thank you for your query, I will try my best to assist you.
I understand that the sound on the HDMI TV, no longer works, but was working previously. Here is a document on Resolving Audio Problems, If this has not resolved the issue would you provide, your exact model of the computer and the operating system you are running. How Do I Find My Model Number or Product Number?
