Assalam o alaikum. Mere pas dell optiplex 755 hai aor windows 7 install ki hoi hai. Lekin us me problem ye hai k us me speaker ya headphones me awaz nhi aati. speaker Icon pe cross ka nishan hai aor likha ata hai No audio Output Device is Installed. Jb device manager me ja kr dekhta hon to sb drivers installed han aor kisi pe b yellow symbol nhi hai. Default driver Hd Audio Controller hai us pr update driver kren to ata hai this driver is up to date. Bht try kia download b kiay lekin awaz nhi aa rhi. Na speaker me na headphones me. Agr koi ap k pas solution ho to btaen