The Ultimate Method for Computer Sound Cards and Graphics Cards

[Problem Description:] The mute section in the small speaker on the taskbar is in a grayed-out, unselectable state. When using QQ video, there is a feature called "play songs for the other person to listen" which is also grayed out and unselectable. In voice chats, when I play songs, others can't hear them, but I can hear them just fine. I call my sound card a "selfish sound card," and it made me really upset for quite some time.

[Solution:] At first, I thought the sound card wasn't installed correctly, so I reinstalled it many times, but it didn't work. Eventually, I discovered that the issue was due to the sound card's driver not being updated in a timely manner, making it incompatible with the system. Finally, I downloaded the latest driver from the website, and it worked.