I hope there are some hints about the causes and consequences, which can narrow the scope of judgment. Otherwise, I can only ask the poster to make his own judgment according to the following steps:

①There are many reasons for the system to have no sound, and the computer has various reasons. The small speaker at the bottom right of the taskbar is missing, so it is impossible to adjust the sound. At this time, you can bring up the small speaker setting icon by: Start→Control Panel→Sounds and Audio Devices→Volume→Check Put the volume icon into the taskbar→OK, and then the small speaker icon for setting the volume will appear. It's in the lower right corner of the taskbar so you can easily adjust the volume.

②If the computer is silent, first check whether any channel is muted in the volume properties. If the sound channel is set to mute, the small speaker icon in the lower right corner of the taskbar will have a red prohibition symbol. How to unmute: right-click the small speaker icon → open the volume control → remove the check mark before muting in the lower left corner of a channel. Some people say that their speakers have sound, but the microphone has no sound (for example, MSN's voice chat microphone cannot record). In fact, that is because the microphone channel is not turned on. The method to open it is: Master Volume→Options→Properties→Check Microphone.

③What should I do if the system is still silent after detecting the above two items? It is possible that the system's sound service is not turned on when the computer starts. The method to turn it on is: Start→Control Panel→Administrative Tools→Services→Click Windows Audio in the service column and select its status as started.

④ If the 360 ??Security Guard software is already installed on the computer, you can also easily start the sound service with the computer here. The steps are: Optimize acceleration→Startup items→System key services→Select Windows Audio (system audio service)→Current status→Enabled.

⑤ You can also reinstall related programs like this. The steps are: Start→Control Panel→Add and Remove Programs→Add/Remove Windows Components, put a check mark in front of "Accessories and Tools", and click "Next ”, then, shut down and restart, the system will prompt you to install new hardware, just follow the prompts to install it.

⑥The above situations all occurred when the system had sound before, but was suddenly harassed by viruses, or caused by certain software, causing no sound. If there is no sound after just installing the operating system, it is more likely that the sound card driver is not installed correctly. The way to check is: Start → Control Panel → System → Hardware → Device Manager → Check whether there is a yellow warning sign in the settings box? If so, it is caused by the hardware driver not being installed correctly. The options for sound cards are sound, video and game controllers. If you are not sure whether there is a problem with the hardware and you have deleted a piece of hardware by mistake, you can also click the Scan to detect hardware changes button on the toolbar to find it. After you find it, you can follow Prompt to install the driver correctly. You can also download automatic update drivers such as Driver Wizard and Driver Life, but there is one thing to note: Do not easily try to update the latest driver when the device is normal, as this will often be counterproductive (those optimized drivers are prepared for players. Check the instructions next to the update carefully)

⑦ If you don’t know the model of the sound card in your computer, you can also use the following method to find it: Start → Run (you can also use the win R shortcut key to call up run) Enter: dxdiag to bring up the hardware diagnostic tool. Once found, you can go to the corresponding official website to download the sound card driver. If the driver CD comes with the computer when you buy it, it is the most reliable driver. Don't blindly think that the latest driver is the best. We often see that some computer users have no sound in the operating system after updating the latest driver. Then I replaced the sound card driver that came with the purchased machine and the sound came back!

⑧Some friends will set the BIOSS sound card to be disabled, so there will be no sound.

Press the del key when booting, enter the BIOS settings, go to the "Integrated Peripherale (Integrated Peripheral Settings)" menu and there is a submenu "AC'97 Audio (AC'97 Sound Card)", which is to set the sound card , set it to "Auto" to enable the sound card integrated on the motherboard, and set it to "Disabled" to disable the sound card integrated on the motherboard.

⑨If the HD sound card recording is grayed out and cannot be set, it needs to be patched →HD sound card patch hdmicpatch.rar

⑩360 Security Guard→Check and kill Trojans→Fix hotspot issues→③The computer has no sound→Repair→Process immediately