I have also faced this problem for the very long time. In my PC also the sound does not work. So first I am thinking that my speaker is not working properly. So I am planning for new speakers to buy. But then recently searching on the internet, I get resolved from this problem. Basically, I visit Netgear Genie support
then I get rid of from this problem. Basically, I do troubleshoot and such things to get rid of. So my PC sound is working properly.