I have been trying to access a zoom meeting. Picture is good but no sound. I have speakers switched on. Going through the "test speakers routine" I can hear the speaker test (the row of squares and the bingbong sounds but message says unable to detect speakers. I suspect windows firewall but why do I get the pictures? I am still happily on Win7 (if it aint broke...) I write as a user not a nerd geek etc but as a simple user. I hope complex explanations beyond me are not needed. Would buying a pair of headphones solve the problem??